Bug 1048717 - [Messages][Refresh] Display call button at the header of single recipient thread. r=schung

I'm ok with current solution since email checking is highly depends on the js. Unless we got different stying of header / panel for email thread, I don't think we have pure/clean css solution for now.

About he un-match number pattern issue, we could address the problem in bug 1032273 since we are not hurry about this(and you still need to remove this workaround after 1032273 landed)