Search in all superclasses in quickfix for NOTHING_TO_OVERRIDE.

idea/testData/quickfix/override/nothingToOverride/beforeAddParameterTwoSupertraits.kt

@@ -0,0 +1,11 @@
+// "Change function signature to 'override fun f(a: Int)'" "true"
+trait A {
+    fun f(a: Int)
+}
+
+trait B : A {
+}
+
+class C : B {
+    <caret>override fun f() {}
+}