New J2K: do not allow field and method declarations to be internal

For internal members new names are generated,
So, references to them from Java will be broken

nj2k/testData/copyPastePlainText/WholeFile.expected.kt

@@ -3,8 +3,8 @@ package to
 import java.util.ArrayList
 
 
-class JavaClass {
-    internal fun foo() {
+internal class JavaClass {
+    fun foo() {
         val list = ArrayList<String>()
         list.add(1)
     }