Change Signature: Rename parameter in overriding functions

#KT-4045 Fixed

idea/testData/refactoring/changeSignature/ParameterChangeInOverridesAfter.kt

@@ -0,0 +1,9 @@
+trait Foo {
+    fun bar(n: Int)
+}
+
+class Baz: Foo {
+    override fun bar(n: Int) {
+
+    }
+}

idea/testData/refactoring/changeSignature/ParameterChangeInOverridesBefore.kt

@@ -0,0 +1,9 @@
+trait Foo {
+    fun <caret>bar(s: String)
+}
+
+class Baz: Foo {
+    override fun bar(s: String) {
+
+    }
+}