Bug 920011 - [DSDS][Dialer] Dialing from call log by tapping instead of showing a menu. r=etienne

Tapping now places a call immediately, except in the DSDS case, where we show
the keypad screen with the contact's number filled in.  Long pressing shows the
old action menu, with the exception of the call button.
Merge pull request #18087 from DouglasSherk/920011-dial-call-log

Bug 920011 - [DSDS][Dialer] Dialing from call log by tapping instead of showing a menu. r=etienne