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

idea/testData/quickfix/createFromUsage/createClass/importDirective/enumWithQualifier.kt.after

@@ -0,0 +1,11 @@
+// "Create enum 'A'" "true"
+package p
+
+import p.X.A
+
+class X {
+    enum class A {
+
+    }
+
+}