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

idea/testData/quickfix/createFromUsage/createVariable/parameter/namedArgInFunctionCall.kt

@@ -0,0 +1,9 @@
+// "Create parameter 's'" "true"
+
+fun foo(n: Int) {
+
+}
+
+fun bar() {
+    foo(n = 1, <caret>s = "2")
+}