fix($core): decode regularPath when generate router config (fix #1946) (#1947)

packages/@vuepress/core/lib/node/internal-plugins/routes.js

@@ -65,10 +65,12 @@ function routesCode (pages) {
   }`
     }
 
-    if (regularPath !== pagePath) {
+    const decodedRegularPath = decodeURIComponent(regularPath)
+
+    if (decodedRegularPath !== pagePath) {
       code += `,
   {
-    path: ${JSON.stringify(regularPath)},
+    path: ${JSON.stringify(decodedRegularPath)},
     redirect: ${JSON.stringify(pagePath)}
   }`
     }