Change Signature: Do not add default values to parameters of overriding functions

#KT-6160 Fixed

idea/testData/refactoring/changeSignature/NoDefaultValuesInOverridesAfter.kt

@@ -0,0 +1,18 @@
+trait T {
+    fun foo(a: Int = 1,
+            b: String = "2")
+}
+
+open class A: T {
+    override fun foo(a: Int,
+                     b: String) {
+        throw UnsupportedOperationException()
+    }
+}
+
+class B: A() {
+    override fun foo(a: Int,
+                     b: String) {
+        throw UnsupportedOperationException()
+    }
+}

idea/testData/refactoring/changeSignature/NoDefaultValuesInOverridesBefore.kt

@@ -0,0 +1,18 @@
+trait T {
+    fun <caret>foo(b: String = "2",
+            a: Int = 1)
+}
+
+open class A: T {
+    override fun foo(b: String,
+                     a: Int) {
+        throw UnsupportedOperationException()
+    }
+}
+
+class B: A() {
+    override fun foo(b: String,
+                     a: Int) {
+        throw UnsupportedOperationException()
+    }
+}