Only show self ident when showing parameter self hints
#6401
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This just hints all self parameters with the
selftoken, this is therefor equal to how all other parameters are displayed, but given the self param special in how its defined in a function signature it might make sense to keep the&/&mutparts as well as emitting those tokens for explictSelftypes that are taken by ref likeself: &Rc<Self>?Fixes #6400