Cleanup quote pattern prototype (#17945)

The `quotedPt` is used when typing the body of the quoted type. It does
not need to appear in the prototype of the quote pattern `unapply`.

Author: nicolasstucki

compiler/src/dotty/tools/dotc/typer/QuotesAndSplices.scala

@@ -443,6 +443,6 @@ trait QuotesAndSplices {
       fun = unapplyFun.appliedToTypeTrees(typeBindingsTuple :: TypeTree(patType) :: Nil),
       implicits = quotedPattern :: Nil,
       patterns = splicePat :: Nil,
-      proto = quoteClass.typeRef.appliedTo(replaceBindings(quoted1.tpe) & quotedPt))
+      proto = quoteClass.typeRef.appliedTo(replaceBindings(quoted1.tpe)))
   }
 }