networks:get, networks:list error parity

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

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

@@ -394,8 +394,8 @@ pub async fn get_network_request(
     } else {
         HttpResponse::NotFound().json(APIErrorsResponse {
             errors: vec![APIError {
-                code: "ERR_MISSING_NETWORK".to_string(),
+                code: "ERR_NOT_FOUND".to_string(),
-                message: "Network does not exist".to_string(),
+                message: "resource not found".to_string(),
                 path: None,
             }],
         })