fix: display "Unflag package" to users who initiated the flag

The original change which fixed another issue by introduced this
inconsistency was located in
archlinux/aurweb!488

What happened was:
1. Before !488, the "Unflag package" link was incorrectly shown to all
   users, even if they couldn't use it. So, users without authority
   were able to click the link which led them to a bad response.
2. !488 solved #1 by only displaying that link for co-maintiainers
   and maintainers in particular.
3. With #2, this also removed the "Unflag package" link for the user
   who initiated the flag on a package.
4. With this commit, we restore the ability for users who initiated
   a flag to view the "Unflag package" link, while keeping it hidden
   for other users which have nothing to do with the package (in terms
   of flag state).

As of now, the following can both view and use "Unflag package":
- Maintainer of the package
- Co-maintainers of the package
- User who flagged the package

While all other users would be able to see the flag comment, but not
perform anything having to do with unflagging the package.

Closes #380

Signed-off-by: Kevin Morris <kevr@0cost.org>
2 jobs for fix-user-unflag in 2 minutes and 48 seconds (queued for 2 seconds)
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