Extract Superclass/Interface: Fix bogus visibility warning inside a member when it's being moved as abstract

#KT-15635 Fixed

idea/testData/refactoring/extractInterface/noWarningOnVisibilityInsideAbstractedMember.kt.after

@@ -0,0 +1,17 @@
+interface I {
+    // INFO: {checked: "true", toAbstract: "true"}
+    fun refer()
+}
+
+// NAME: I
+// SIBLING:
+class BrokenRef : I {
+    private fun fun1() {}
+    fun fun2() {}
+
+    // INFO: {checked: "true", toAbstract: "true"}
+    override fun refer() {
+        fun1()
+        fun2()
+    }
+}