Small format fix

Author: nicolasstucki

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

@@ -1194,10 +1194,10 @@ object Denotations {
         val owner = prefix.disambiguate(_.info.isParameterless)
         def isPackageFromCoreLibMissing: Boolean = {
           owner.symbol == defn.RootClass &&
-          {
+          (
             selector == nme.scala_ || // if the scala package is missing, the stdlib must be missing
             selector == nme.scalaShadowing // if the scalaShadowing package is missing, the dotty library must be missing
-          }
+          )
         }
         if (owner.exists) {
           val result = if (isPackage) owner.info.decl(selector) else owner.info.member(selector)