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

idea/testData/quickfix/createFromUsage/createFunction/call/funOnTrait.kt.after

@@ -0,0 +1,9 @@
+// "Create function 'foo'" "true"
+
+trait T {
+    fun foo(s: String, i: Int): Boolean
+}
+
+fun test(t: T) {
+    val b: Boolean = t.foo("1", 2)
+}