Revert change in annotation creation

Author: nicolasstucki

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

@@ -478,6 +478,6 @@ trait QuotesAndSplices {
         implicits = quotedPattern :: Nil,
         patterns = splicePat :: Nil),
       TypeTree(quoteClass.typeRef.appliedTo(replaceBindings(quoted1.tpe) & quotedPt))
-    ).annotated(New(defn.UncheckedAnnot.typeRef, Nil))
+    ).annotated(New(ref(defn.UncheckedAnnot.typeRef)))
   }
 }