Removing the last favorite doesn't change the number of favorite in the page title
Steps to reproduce
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Add 1 track to the favorite (not more than 1!)
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Go to /favorites/
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The title is: "1 favorite"
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Remove the track from the favorites
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The titles updates to "1 favorites" instead of "0 favorites"
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If you update the page, then it is correct: "0 favorites"
Funkwhale version(s) affected: 0.18-dev