apps/app_confbridge: Ensure 'normal' users hear message when last marked leaves

When r428077 was made for ASTERISK-24522, it failed to take into account users
who are neither wait_marked nor end_marked. These users are *also* supposed to
hear the 'leader has left the conference' message. Granted, this behaviour is
a bit odd; however, that is how it used to work... and behaviour changes are
not good.

This patch ensures that if there are any 'normal' users present when the last
marked user leaves the conference, the message will still be played to them.

Note that this regression was caught by the Asterisk Test Suite's
confbridge_nominal test, which has a quirky combination of users.
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Merged revisions 428113 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 428114 from http://svn.asterisk.org/svn/asterisk/branches/12
........

Merged revisions 428115 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@428116 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/confbridge/conf_state_multi_marked.c

@@ -107,6 +107,11 @@ static void leave_marked(struct confbridge_user *user)
 				user_iter->conference->activeusers--;
 				AST_LIST_INSERT_TAIL(&user_iter->conference->waiting_list, user_iter, list);
 				user_iter->conference->waitingusers++;
+			} else {
+				/* User is neither wait_marked nor end_marked; however, they
+				 * should still hear the prompt.
+				 */
+				need_prompt = 1;
 			}
 		}
 		AST_LIST_TRAVERSE_SAFE_END;