Fix trending page by leaving livestream and gaming trending pages (#5555)

The livestream trending page is now the default.

Adds `content_container = special_category_container["gridRenderer"]?` in the `CategoryRendererParser`
needed for the gaming trending page. The JSON structure of the gaming
trending page looked like this:

```json
"contents": {
 "twoColumnBrowseResultsRenderer": {
  "tabs": [
   {
    "tabRenderer": {
     "selected": true,
     "content": {
      "sectionListRenderer": {
       "contents": [
        {
         "itemSectionRenderer": {
          "contents": [
           {
            "shelfRenderer": {
             "title": {
              "runs": [
               {
                "text": "Trending videos"
               }
              ]
             },
             "content": {
              "gridRenderer": { // <- This was added to the CategoryRendererParser
               "items": [
                {
                 "gridVideoRenderer": {
                  "videoId": "sTWztaLjD20",
                  // More video data
                  // ...
                 }
                }
               ]
              }
             }
            }
           }
          ]
         }
        }
       ]
      }
     }
    }
   }
  ]
 }
}
```

Thanks to
ae2755bf71/extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/kiosk/YoutubeTrendingGamingVideosExtractor.java (L11-L13)
for the `browse_id` and `params` needed for the gaming trending page.

src/invidious/views/feeds/trending.ecr

@@ -21,7 +21,7 @@
     </div>
     <div class="pure-u-1-3">
         <div class="pure-g" style="text-align:right">
-            <% {"Default", "Music", "Gaming", "Movies", "Livestreams"}.each do |option| %>
+            <% {"Livestreams", "Gaming"}.each do |option| %>
                 <div class="pure-u-1 pure-md-1-3">
                     <% if trending_type == option %>
                         <b><%= translate(locale, option) %></b>