manatee: Fix komga-comicbooktracker credentials file permissions

hosts/manatee/modules/komga/default.nix

@@ -47,6 +47,8 @@ in
     age.secrets = {
       "komga-comicbooktracker-credentials" = {
         file = ../../../../secrets/manatee/komga-comicbooktracker-credentials.age;
+        owner = "alex";
+        group = "users";
       };
     };
   };