Replace remaining shell references with service manager

ash/autoclick/mus/manifest.json

 {
   "manifest_version":  1,
   "name": "service:accessibility_autoclick",
   "display_name": "Autoclick",
   "capabilities": {
     "provided": {
       "mash:launchable": [ "mash::mojom::Launchable" ],
       "ash:autoclick": [ "ash::autoclick::mojom::AutoclickController" ]
     },
     "required": {
       "*": [ "app" ],
-      "service:shell": [ "shell:service_manager" ]
+      "service:service_manager": [ "service_manager:service_manager" ]
     }
   }
 }