Bug 913994 - [Messages] When sending SMS to a number included in a SMS, we should load the thread after clicking on send r=gnarf

The problem was simple: we were not resetting inThread when handling the #new
hash.
Merge pull request #12515 from julienw/913994-conversation-not-shown-after-sending-sometimes

Bug 913994 - [Messages] When sending SMS to a number included in a SMS, ...