Fix memory leak in win_create_muc()

I suspect this was just a copy paste error.
`_win_create_simple_layout()` is called in other creation functions like
`win_create_config()` or `win_create_private()`.

I suspect when `win_create_muc()` was created it was just copied. But in
this function we actually set the layout ourself later.

So calling the function isn't needed.

Regards https://github.com/profanity-im/profanity/issues/1279

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