Bug 857942 - Select All button in Edit Messages screen is not enabled when we receive a new sms. r=fernando.campo

changes made to 773977c1d24d23609fcf848c9f448f64e65e17f1.
Merge pull request #9056 from comoyo/sms_selectall

Bug 857942 - Select All button in Edit Messages screen is not enabled when we receive a new sms. r=fernando.campo