Fix a near instant stats permission check false negative.

The MODE_DEFAULT enforcePermission behavior fell through to
the switch default case, even if the calling permission was
granted.

Bug: 34258237
Test: Manual
Change-Id: I823fb4dc3657c15eb1fa3d12d4f4c7e1e9e21cd5

services/usage/java/com/android/server/usage/StorageStatsService.java

@@ -86,6 +86,7 @@ public class StorageStatsService extends IStorageStatsManager.Stub {
             case AppOpsManager.MODE_DEFAULT:
                 mContext.enforceCallingPermission(
                         android.Manifest.permission.PACKAGE_USAGE_STATS, TAG);
+                return;
             default:
                 throw new SecurityException("Blocked by mode " + mode);
         }