Fix for DisconnectCause.INVALID_NUMBER being returned

The local variable action wasn't being updated with new intent action
after rewriteCallIntentAction was called, causing it to retain the value of
CALL_PRIVILEGED and the INVALID_NUMBER codepath to be executed.

Bug: 17430765
Change-Id: I092b94f2cbaec8fbf9d39c739a6c976483869526