fix mbtiles source

src/serve_data.js

@@ -116,7 +116,7 @@ export const serve_data = {
       },
     );
 
-    app.get('/:id/:t(\\d+)/:z(\\d+)/:x(\\d+)/:y(\\d+).:format([\\w.]+)', (req, res, next) => {
+    app.get('/:id/:t(\\d+)/:z(\\  d+)/:x(\\d+)/:y(\\d+).:format([\\w.]+)', (req, res, next) => {
       const item = repo[req.params.id];
       if (!item) {
         return res.sendStatus(404);