Cleanup the unused symbol Definitions.QuotedRuntimePatterns_patternHi… (#18191)

This small PR simply removes the unused symbol
`Definitions.QuotedRuntimePatterns_patternHigherOrderHole`.

Author: nicolasstucki

compiler/src/dotty/tools/dotc/core/Definitions.scala

@@ -880,7 +880,6 @@ class Definitions {
 
   @tu lazy val QuotedRuntimePatterns: Symbol = requiredModule("scala.quoted.runtime.Patterns")
     @tu lazy val QuotedRuntimePatterns_patternHole: Symbol = QuotedRuntimePatterns.requiredMethod("patternHole")
-    @tu lazy val QuotedRuntimePatterns_patternHigherOrderHole: Symbol = QuotedRuntimePatterns.requiredMethod("patternHigherOrderHole")
     @tu lazy val QuotedRuntimePatterns_higherOrderHole: Symbol = QuotedRuntimePatterns.requiredMethod("higherOrderHole")
     @tu lazy val QuotedRuntimePatterns_patternTypeAnnot: ClassSymbol = QuotedRuntimePatterns.requiredClass("patternType")
     @tu lazy val QuotedRuntimePatterns_fromAboveAnnot: ClassSymbol = QuotedRuntimePatterns.requiredClass("fromAbove")