QuickFixMultiModule: change tests structure

idea/testData/multiModuleQuickFix/createExpect/enum/header/My.kt

@@ -0,0 +1,2 @@
+// My: to be implemented
+// DISABLE-ERRORS

idea/testData/multiModuleQuickFix/createExpect/enum/header/My.kt.after

@@ -0,0 +1,6 @@
+// My: to be implemented
+// DISABLE-ERRORS
+expect enum class My {
+    FIRST, SECOND, LAST;
+
+}