Support dynamic org-agenda-files in org-ql-view buffers on refresh

If I call `(org-ql-search (org-agenda-files) '(todo))` it opens an org-ql-view buffer.

Pressing `v i` I can see that it has the expected:

```
a.org
```

Then in a scratch buffer I add `b.org` to `org-agenda-files`.

I go back to the org-ql-view buffer and refresh.

expected: The org-ql-view buffer calls `(org-agenda-files)` and searches `b.org`
actual: Only `a.org` is searched