Fix infinite image pathes

Author: smnandre

ux.symfony.com/templates/demos/live_demo.html.twig

@@ -9,7 +9,7 @@
         description: demo.longDescription|striptags|u.truncate(200, '...')
     },
     image: {
-        url: absolute_url(asset(demo.screenshotFilename('1280x720')),
+        url: absolute_url(asset(demo.screenshotFilename('1280x720'))),
         width: 1280,
         height: 720,
     },

ux.symfony.com/templates/demos/live_memory/index.html.twig

@@ -6,7 +6,7 @@
     description: demo.description,
     canonical: url(demo.route),
     image: {
-        url: absolute_url(asset(demo.screenshotFilename('1280x720')),
+        url: absolute_url(asset(demo.screenshotFilename('1280x720'))),
         width: 1080,
         height: 720,
     },