Extract Superclass: Fix visibility lifting when moving to interface

#KT-16281 Fixed

idea/testData/refactoring/extractInterface/liftProtected.kt

@@ -0,0 +1,8 @@
+// NAME: IPurePrivate
+// SIBLING:
+class PurePrivate {
+    // INFO: {checked: "true", toAbstract: "true"}
+    protected var protectedVar = 0
+    // INFO: {checked: "true", toAbstract: "true"}
+    protected fun protectedFun() {}
+}