QuickFixMultiModule: change tests structure

idea/testData/multiModuleQuickFix/other/createFunInExpectClass/header/header.kt.after

@@ -0,0 +1,9 @@
+// "Create member function 'Foo.foo'" "true"
+
+expect class Foo {
+    fun foo(s: String, i: Int)
+}
+
+fun test(f: Foo) {
+    f.foo("a", 1)
+}