Properly handle JACK crashes.

JACK disappear was already detected, now it implies that server is stopped

gui/main.c

@@ -606,6 +606,8 @@ void jack_disappeared(void)
 {
   log_info("JACK disappeared");
 
+  jack_stopped();
+
 #if defined(SHOW_RAW_JACK)
   if (g_jack_view != NULL)
   {