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

idea/testData/quickfix/insertDelegationCall/primaryRequiredNoSuper.kt

@@ -0,0 +1,9 @@
+// "Insert 'super()' call" "false"
+// ACTION: Insert 'this()' call
+// ERROR: Primary constructor call expected
+
+open class B()
+
+class A(val x: Int) : B() {
+    constructor(x: String)<caret>
+}