app_dial: Fix DTMF not relayed to caller on unanswered calls.
DTMF frames are not handled in app_dial when sent towards the caller. This means that if DTMF is sent to the calling party and the call has not yet been answered, the DTMF is not audible. This is now fixed by relaying DTMF frames if only a single destination is being dialed. ASTERISK-29516 #close Change-Id: Iafd7430ac2915126d42dc48f0b73b262452ee027 (cherry picked from commit 090ec448cffc4b73e7840347aa148b5fc9181e8a)
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