Convert Sealed Class to Enum: Support expect/actual classes

#KT-18912 Fixed

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

@@ -0,0 +1,5 @@
+// "Convert to enum class" "true"
+
+expect enum class <caret>E {
+    A, B, C
+}