chore: fix the path to screenshot on apps show page (#4256)

routes/apps/show.js

@@ -29,10 +29,11 @@ module.exports = (req, res, next) => {
     })
   }
 
-  context.page.image =
+  const appImageUrl =
     app.screenshots && app.screenshots.length
       ? app.screenshots[0].imageUrl
-      : `${req.context.hostname}/images/apps/${app.icon64}`
+      : `${req.context.hostname}/app-img/${app.slug}/${app.icon64}`
+  context.page.image = appImageUrl
 
   if (app.youtube_video_url) {
     context.app.youtube_video_url = app.youtube_video_url.replace(