New J2K: do not print modifiers which are going to be removed in postprocessing

nj2k/testData/newJ2k/function/override.kt

@@ -3,5 +3,5 @@ internal open class A {
 }
 
 internal class B : A() {
-    override fun a() {}
+    public override fun a() {}
 }

nj2k/testData/newJ2k/function/overrideAndOpen.kt

@@ -3,7 +3,7 @@ internal open class A {
 }
 
 internal open class B : A() {
-    override fun foo() {}
+    public override fun foo() {}
 }
 
 internal class C : B() {