MINOR: applets: no need to check for runqueue's emptiness in appctx_res_wakeup()

The __appctx_wakeup() function already does it. It matters with threads
enabled because it simplifies the code in appctx_res_wakeup() to get rid
of this test.
diff --git a/include/proto/applet.h b/include/proto/applet.h
index a6f2633..51a7e26 100644
--- a/include/proto/applet.h
+++ b/include/proto/applet.h
@@ -147,11 +147,6 @@
 		SPIN_UNLOCK(APPLETS_LOCK, &applet_active_lock);
 		return 1;
 	}
-
-	if (!LIST_ISEMPTY(&appctx->runq)) {
-		SPIN_UNLOCK(APPLETS_LOCK, &applet_active_lock);
-		return 0;
-	}
 	__appctx_wakeup(appctx);
 	SPIN_UNLOCK(APPLETS_LOCK, &applet_active_lock);
 	return 1;