Fix Style/IsAFilter issues

src/invidious/helpers/errors.cr

@@ -132,8 +132,6 @@ def error_redirect_helper(env : HTTP::Server::Context, locale : Hash(String, JSO
         </li>
       </ul>
     END_HTML
-
-    return next_step_html
   else
     return ""
   end

src/invidious/routes/channels.cr

@@ -29,7 +29,7 @@ module Invidious::Routes::Channels
           item.author
         end
       end
-      items = items.select(&.is_a?(SearchPlaylist)).map(&.as(SearchPlaylist))
+      items = items.select(SearchPlaylist).map(&.as(SearchPlaylist))
       items.each(&.author=(""))
     else
       sort_options = {"newest", "oldest", "popular"}
@@ -57,7 +57,7 @@ module Invidious::Routes::Channels
     end
 
     items, continuation = fetch_channel_playlists(channel.ucid, channel.author, continuation, sort_by)
-    items = items.select { |item| item.is_a?(SearchPlaylist) }.map { |item| item.as(SearchPlaylist) }
+    items = items.select(SearchPlaylist).map { |item| item.as(SearchPlaylist) }
     items.each(&.author=(""))
 
     templated "playlists"

src/invidious/routes/playlists.cr

@@ -245,7 +245,7 @@ module Invidious::Routes::Playlists
     if query
       begin
         search_query, count, items, operators = process_search_query(query, page, user, region: nil)
-        videos = items.select { |item| item.is_a? SearchVideo }.map { |item| item.as(SearchVideo) }
+        videos = items.select(SearchVideo).map { |item| item.as(SearchVideo) }
       rescue ex
         videos = [] of SearchVideo
         count = 0

src/invidious/yt_backend/extractors_utils.cr

@@ -40,7 +40,7 @@ def extract_videos(initial_data : Hash(String, JSON::Any), author_fallback : Str
       target << i
     end
   end
-  return target.select(&.is_a?(SearchVideo)).map(&.as(SearchVideo))
+  return target.select(SearchVideo).map(&.as(SearchVideo))
 end
 
 def extract_selected_tab(tabs)