Telephony: fix Flip to mute/silent

maybe fix http://jira.omnirom.org/browse/OMNI-412

Change-Id: Ie12ff6aab6ffdaf8638e0ac39f3911f7ecb8793c
Fix public issue #18054: USSD in-call toast

Removes useless toast displayed when sending USSD during a call.

http://code.google.com/p/android/issues/detail?id=18054

The removed code used to be in the InCallScreen class from the
Phone app. See (now obsolete, abandonned and replaced by this
change) change #36090. A long time ago, the in-call CALL MMI did
not triggered normal MMI dialogs, hence the toast. Dialog was
fixed, toast remained.

Change-Id: I6ba8be9c0e881cfbc3733b56defd7627d88c6b7e
[4/4] Telephony: Breathing missedcall/sms/voicemail

Base: https://gerrit.omnirom.org/#/c/4976/
Mms: https://gerrit.omnirom.org/#/c/4977/
OmniGears: https://gerrit.omnirom.org/#/c/4978/

Change-Id: I0e0d6762d1b2aeeb2109a358dffe62ecc825c932