Create actual fix: handle companions correctly #KT-21114 Fixed

idea/testData/multiModuleQuickFix/companionAbsence/header/header.kt

@@ -0,0 +1,7 @@
+// DISABLE-ERRORS
+
+expect class WithCompanion {
+    companion object {
+        fun foo()
+    }
+}

idea/testData/multiModuleQuickFix/companionAbsence/header/header.kt.after

@@ -0,0 +1,7 @@
+// DISABLE-ERRORS
+
+expect class WithCompanion {
+    companion object {
+        fun foo()
+    }
+}