compositor: remove unused field option_idle_time

src/compositor.c

@@ -3572,7 +3572,6 @@ int main(int argc, char *argv[])
 	sigaction(SIGSEGV, &segv_action, NULL);
 	segv_compositor = ec;
 
-	ec->option_idle_time = idle_time;
 	ec->idle_time = idle_time;
 
 	setenv("WAYLAND_DISPLAY", socket_name, 1);

src/compositor.h

@@ -324,8 +324,7 @@ struct weston_compositor {
 	uint32_t state;
 	struct wl_event_source *idle_source;
 	uint32_t idle_inhibit;
-	int option_idle_time;		/* default timeout, s */
-	int idle_time;			/* effective timeout, s */
+	int idle_time;			/* timeout, s */
 
 	/* Repaint state. */
 	struct wl_array vertices;