fix db limit error message set order

lib/cartodb/api/middlewares/error-middleware.js

@@ -56,13 +56,15 @@ function populateTimeoutErrors (errors) {
             error.subtype = 'render';
         }
 
+        const IS_DATASOURCE_TIMEOUT_ERROR = isDatasourceTimeoutError(error);
+
         if (isTimeoutError(error)) {
             error.message = 'You are over platform\'s limits. Please contact us to know more details';
             error.type = 'limit';
             error.http_status = 429;
         }
 
-        if (isDatasourceTimeoutError(error)) {
+        if (IS_DATASOURCE_TIMEOUT_ERROR) {
             error.subtype = 'datasource';
             error.message = 'You are over platform\'s limits: SQL query timeout error.' +
                 ' Refactor your query before running again or contact CARTO support for more details.';