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

idea/testData/quickfix/createFromUsage/createSecondaryConstructor/delegatorToSuperCallNoClass.kt

@@ -0,0 +1,10 @@
+// "Create secondary constructor" "false"
+// ERROR: This class does not have a constructor
+
+trait T {
+
+}
+
+class A: T(<caret>1) {
+
+}