J2K: do not produce redundant "internal" words for members in an internal class

j2k/testData/fileOrElement/class/classWithMultiplyFields.kt

@@ -1,5 +1,5 @@
 internal class T {
-    internal var a: String
-    internal var b: String
-    internal var c = "abc"
+    var a: String
+    var b: String
+    var c = "abc"
 }