Handle UNSOL_STK_EVENT_NOTIFY command message properly.

Currently, in scenario where the UNSOL_STK_EVENT_NOTIFY is
handled, and there is a main menu selection followed by, results
in sending of unwanted terminal response instead of envelope
command from the framework.

Set the CurrentCmd to MainCmd after launching the event
message in StkAppService, while handling UNSOL_STK_EVENT_NOTIFY.
This ensures the CurrentCmd still points to SEND_SMS instead of
SET_UP_MENU.

Change-Id: Iaef76df6d63cd056eceae4c6cfada175a41784e6
1 file changed