KBFS GUI disallows favorites with current user as the only writer

I think it may just be a quirk of the current GUI's text field causing this issue. Using `1.0.16-20160624110018+8ca7e60` I tried [including the number sign, '#'](https://keybase.io/docs/kbfs/understanding_kbfs) to reference a TLF with my user as the only writer and others as read-only, but the favorite wasn't recognized, e.g.:

(It looks like the comma is always assumed.) But this works fine:

```
$ pwd
/keybase/private
$ cd petethomas#max
$ ls
```

And this works fine:

Start with the KBFS GUI favorite text field and reproduce the issue using a TLF where the current user is the only writer, such as the `petethomas#max` example. Compare the GUI behavior with the working `/keybase/private` command-line example. Done means the GUI recognizes and opens favorites containing `#` when the current user is the only writer.

Written by the indexing model from the issue text.