QuickFixMultiModule: change tests structure

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

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

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

@@ -0,0 +1,8 @@
+// My: to be implemented
+// DISABLE-ERRORS
+expect enum class My {
+    ;
+
+    fun getHello(): String
+
+}