Simplify type splicing

Author: nicolasstucki

compiler/src/dotty/tools/dotc/core/quoted/PickledQuotes.scala

@@ -143,9 +143,7 @@ object PickledQuotes {
             case tp: ClassInfo =>
               tp.derivedClassInfo(classParents = tp.classParents.map(apply))
             case tp: TypeRef =>
-              typeSpliceMap.get(tp.symbol) match
-                case Some(t) if tp.typeSymbol.hasAnnotation(defn.InternalQuoted_QuoteTypeTagAnnot) => mapOver(t)
-                case _ => mapOver(tp)
+              mapOver(typeSpliceMap.getOrElse(tp.symbol, tp))
             case _ =>
               mapOver(tp)
           }