[BUG] User.mutual_guilds is broken

[Kigstn]

Describe the bug
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User.mutual_guilds is broken since User.user_guilds does not exist

To Reproduce
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Try to use User.mutual_guilds

Expected behaviour
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A list of mutual guilds

Additional information
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Too tired to fix myself, this also looks like it may be annoying to fix

[LordOfPolls]

Fixed in c212ade