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

idea/testData/quickfix/insertDelegationCall/nonApplicableOnEmpty.kt

@@ -0,0 +1,10 @@
+// "Insert 'this()' call" "true"
+// ERROR: There's a cycle in the delegation calls chain
+
+open class B(val x: Int)
+
+class A : B {
+    constructor()<caret>
+
+    constructor(x: String) : super(1)
+}