Set quieted flag when receiving a dtmf tone during playback in speechbackground.

(closes issue #16966)
Reported by: asackheim


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@264334 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_speech_utils.c

@@ -735,6 +735,7 @@ static int speech_background(struct ast_channel *chan, void *data)
 				if (dtmf_terminator != '\0' && f->subclass == dtmf_terminator) {
 					done = 1;
 				} else {
+					quieted = 1;
 					if (chan->stream != NULL) {
 						ast_stopstream(chan);
 					}