fix: .md debug mode (#2239)

Author: Jinbao1001

src/templates/meta/runtime.ts.tpl

@@ -17,7 +17,7 @@ export const patchRoutes = ({ routes }) => {
     const routeMeta = getRouteMetaById(route.id, { syncOnly: true });
 
     if (routeMeta) {
-      if (process.env.NODE_ENV === 'production' && (route.meta?.frontmatter?.debug || routeMeta.debug)) {
+      if (process.env.NODE_ENV === 'production' && (route.meta?.frontmatter?.debug || routeMeta.frontmatter?.debug)) {
         // hide route in production which set hide frontmatter
         delete routes[route.id];
       } else {