Remove a remnant of dyn* from the parser
#148673
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Follow-up to #146664 and #143036.
is_explicit_dyn_typestill checked forTokenKind::Starwhich made no sense now thatdyn*is no more.Removing it doesn't represent a functional change and merely affects diagnostics. That's because the check only dictated whether to interpret
dynas the start of a trait object type in Rust 2015 (where this identifier is only a contextual keyword). However, we would still fail at the*later on as it doesn't start a bound.While at it, I also took the time to clean up in the vicinity.