Remove optimization that is also done later in ReifyQuotes

Author: nicolasstucki

compiler/src/dotty/tools/dotc/transform/Staging.scala

@@ -301,12 +301,7 @@ class Staging extends MacroTransformWithImplicits {
      */
     private def quotation(body: Tree, quote: Tree)(implicit ctx: Context): Tree = {
       val isType = quote.symbol eq defn.QuotedType_apply
-      if (body.symbol.isSplice) {
-        // simplify `'(~x)` to `x` and then transform it
-        val Select(splice, _) = body
-        transform(splice)
-      }
-      else if (level > 0) {
+      if (level > 0) {
         val body1 = nested(isQuote = true).transform(body)
         // Keep quotes as trees to reduce pickled size and have a Expr.show without pickled quotes
         if (isType) ref(defn.QuotedType_apply).appliedToType(body1.tpe.widen)