Mms: Fix force close when MT SMS to SIM card continuous

mCursor may be accessed by Activity, but it is closed in onQueryComplete
by mListAdapter#changeCursor(mCursor) method. And that will cause
the StaleDataException.

Call stopManagingCursor() in onQueryComplete before close the cursor.

CRs-Fixed: 744823

Change-Id: I978f14afab6e83610b2ca7a615fd1a71e6cfc407