What does this PR do?
When updating a custom emoji, if the actual image has been changed, delete the previous file.
It's the same code that 5f7fc54e added to delete and deleteBulk, with the extra check that we're not deleting the same file we're setting.
As with delete, there is a small risk of deleting a file that's actually in use, because a drive file can be attached to a note and used as a profile icon and also as an emoji… Should we check this?
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