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

idea/testData/quickfix/createFromUsage/createFunction/call/memberVarDelegateRuntime.kt

@@ -0,0 +1,5 @@
+// "Create function 'foo'" "true"
+
+class A<T>(val t: T) {
+    var x: A<Int> by <caret>foo(t, "")
+}