KT-1717 Don't make member visibility inherit when it is not declared explicitly

#KT-1717 Fixed

compiler/testData/codegen/objects/objectLiteral.jet

@@ -1,7 +1,7 @@
 class C(x: Int, val y : Int) {
   fun initChild(var x: Int) : java.lang.Object {
     return object : java.lang.Object() {
-      override fun toString(): String? {
+      public override fun toString(): String? {
           x = x + y
           return "child" + x
       }

compiler/testData/codegen/objects/objectLiteralInClosure.jet

@@ -3,7 +3,7 @@ package p
 class C(val y : Int) {
   val initChild = { ->
     object : java.lang.Object() {
-      override fun toString(): String {
+      public override fun toString(): String {
           return "child" + y
       }
     }