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

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

@@ -0,0 +1,9 @@
+// "Create secondary constructor" "true"
+
+open class A {
+
+}
+
+class B: A(<caret>1) {
+
+}