roles:get error parity

References: https://todo.e3t.cc/~core/trifid/1

trifid-api/src/routes/v1/roles.rs

@@ -822,8 +822,8 @@ pub async fn get_role(
     } else {
         HttpResponse::NotFound().json(APIErrorsResponse {
             errors: vec![APIError {
-                code: "ERR_MISSING_ROLE".to_string(),
+                code: "ERR_NOT_FOUND".to_string(),
-                message: "Role does not exist".to_string(),
+                message: "resource not found".to_string(),
                 path: None,
             }],
         })