search_inside API does not work for some items with spaces in the document name

Searching the text contents of some items is failing with a message that simply states "Sorry, there was an error with your search. Please try again."

It appears to be tied to the `fulltext/inside.php` endpoint, and I suspect it is an issue of query params not being encoded somewhere in the API backend.

### Evidence / Screenshot (if possible)

Here is the error thrown by ia-sentry.min.js in the developer console after executing a search:
```
Search Inside Response Error Whoops! Traceback (most recent call last):
File "./inside.py", line 158, in
reply = urllib.request.urlopen(es_url).read()
File "/usr/lib/python3.8/urllib/request.py", line 222, in urlopen
return opener.open(url, data, timeout)
File "/usr/lib/python3.8/urllib/request.py", line 525, in open
response = self._open(req, data)
File "/usr/lib/python3.8/urllib/request.py", line 542, in _open
result = self._call_chain(self.handle_open, protocol, protocol +
File "/usr/lib/python3.8/urllib/request.py", line 502, in _call_chain
result = func(*args)
File "/usr/lib/python3.8/urllib/request.py", line 1397, in https_open
return self.do_open(http.client.HTTPSConnection, req,
File "/usr/lib/python3.8/urllib/request.py", line 1354, in do_open
h.request(req.get_method(), req.selector, req.data, headers,
File "/usr/lib/python3.8/http/client.py", line 1256, in request
self._send_request(method, url, body, headers, encode_chunked)
File "/usr/lib/python3.8/http/client.py", line 1267, in _send_request
self.putrequest(method, url, **skips)
File "/usr/lib/python3.8/http/client.py", line 1101, in putrequest
self._validate_path(url)
File "/usr/lib/python3.8/http/client.py", line 1201, in _validate_path
raise InvalidURL(f"URL can't contain control characters. {url!r} "
http.client.InvalidURL: URL can't contain control characters. '/api/v1/searchinside?exists=true&ia_id=nintendo-magazine-system-uk-43-april-1996&filename=Nintendo Magazine System (UK) 43 April 1996_abbyy.gz' (found at least ' ')
```

This looks like the doc name passed to the `filename` query param somewhere in the backend is not being encoded.

The corresponding network request does appear to encode the doc name from the given payload:

```
item_id: nintendo-magazine-system-uk-43-april-1996
doc: Nintendo Magazine System (UK) 43 April 1996
path: /27/items/nintendo-magazine-system-uk-43-april-1996
q: "mario rpg"
pre_tag: {{{
post_tag: }}}
callback: jQuery36107855882184027965_1697993173593
```

URL: https://ia601906.us.archive.org/fulltext/inside.php?item_id=nintendo-magazine-system-uk-43-april-1996&doc=Nintendo%20Magazine%20System%20(UK)%2043%20April%201996&path=/27/items/nintendo-magazine-system-uk-43-april-1996&q=%22mario%20rpg%22&pre_tag=%7B%7B%7B&post_tag=%7D%7D%7D&callback=jQuery36107855882184027965_1697993173593

### Relevant url?
Example of an item experiencing this error: https://archive.org/details/nintendo-magazine-system-uk-43-april-1996/

(This isn't explicitly an openlibrary.org url, so apologies if this is the wrong repo to file this issue under, but this endpoint is covered under the [openlibrary API documentation](https://openlibrary.org/dev/docs/api/search_inside), and I don't know which of the 200+ repos owned by internetarchive might contain "inside.py" or "inside.php".)

### Steps to Reproduce
1. I was searching in archive.org for items containing the text "mario rpg" (in quotes): https://archive.org/search?query=%22mario+rpg%22&sin=TXT
2. The above linked item appears as a search result. Navigating into the item immediately shows the above screenshotted error.
3. Loading the item URL in a new tab and searching for the quoted text displays the same error.

* Actual: The developer console displays the above ia-sentry.min.js Javascript error and the network console should display a successful 200 response from the above /inside.php request.
* Expected: The left side pane would show search results successfully.

### Details

- **Logged in (Y/N)?** Y
- **Browser type/version?** Chrome 118.0.5993.70 ARM64
- **Operating system?** Mac OS Ventura 13.5.2
- **Environment (prod/dev/local)?** prod

### Proposal & Constraints
The URL constructed in inside.py should be fully encoded, including the params. (probably simple enough to not need an example, but in the interest of meeting the requirements: https://stackoverflow.com/a/69811079/5306408)

### Related files
I can't actually find them. There's an inside.php and inside.py and one or the other is likely to be the culprit, but they don't appear to be in this repository. I opened the issue here because that endpoint is covered by the openlibrary API docs.

### Stakeholders