Big change in quickfix tests: no stupid test data format with "before" and "after" file prefixes

idea/testData/quickfix/insertDelegationCall/nonApplicableInsertSuper.kt

@@ -0,0 +1,8 @@
+// "Insert 'super()' call" "true"
+// ERROR: No value passed for parameter x
+
+open class B(val x: Int)
+
+class A : B {
+    constructor(x: String)<caret>
+}