Indicate talk group selection timeout using a sound

src/svxlink/svxlink/ReflectorLogic.tcl

@@ -154,6 +154,12 @@ proc tg_default_activation {new_tg old_tg} {
 #
 proc tg_selection_timeout {new_tg old_tg} {
   #puts "### tg_selection_timeout"
+  if {$old_tg != 0} {
+    playSilence 100
+    playTone 440 200 50
+    playTone 659 200 50
+    playTone 880 200 50
+  }
 }