* add test for emoji update image
* update emoji recache to set the instance account id
* don't refresh emoji if only not cached. in that case literally just recache
* code comment
* rename + move a few things
* add some more code comments, and rename some functions to make logic a bit clearer
* remove unnecessary nil check (the value can be nil)
* comment wording
* remove test data output
* handle the case of caching an emoji which has been refreshed then uncached
* allow overwriting on testrig storage as we do now on regular storage
* fix emoji category ID not getting updated
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Co-authored-by: tobi <tobi.smethurst@protonmail.com>
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