gnome: fix Control+Q quit on gtk+<3.12

Issue: #79643
Change-Id: I1a7e2c86d773e456f1163d5f118fd675d9ecf041
diff --git a/src/ring_client.cpp b/src/ring_client.cpp
index 49e8928..09b24a7 100644
--- a/src/ring_client.cpp
+++ b/src/ring_client.cpp
@@ -123,7 +123,7 @@
     const gchar *quit_accels[2] = { "<Ctrl>Q", NULL };
     gtk_application_set_accels_for_action(GTK_APPLICATION(client), "app.quit", quit_accels);
 #else
-    gtk_application_add_accelerator(GTK_APPLICATION(client), "<Control>Q", "win.quit", NULL);
+    gtk_application_add_accelerator(GTK_APPLICATION(client), "<Control>Q", "app.quit", NULL);
 #endif
 }