Start capture on output switch iff clients are connected

Signed-off-by: Jim Ramsay <i.am@jimramsay.com>

src/main.c

@@ -1054,6 +1054,7 @@ void switch_to_output(struct wayvnc* self, struct output* output)
 	screencopy_stop(&self->screencopy);
 	set_selected_output(self, output);
 	reinitialise_pointers(self);
+	if (self->nr_clients > 0)
 		wayvnc_start_capture_immediate(self);
 }