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

idea/testData/quickfix/createFromUsage/createClass/callExpression/callWithClassQualifier.kt

@@ -0,0 +1,9 @@
+// "Create class 'Foo'" "true"
+
+class A<T>(val n: T) {
+
+}
+
+fun test() {
+    val a = A.<caret>Foo(2)
+}