Revert "Videos: Fix audio tracks language."

Reverting this commit before merging https://github.com/iv-org/invidious/pull/5149 from upstream

This reverts commit c61b2963ac.

src/invidious/routes/api/manifest.cr

@@ -60,10 +60,6 @@ module Invidious::Routes::API::Manifest
       end
     end
 
-    audio_streams.reject! do |z|
-      z if z.dig?("audioTrack", "audioIsDefault") == false
-    end
-
     manifest = XML.build(indent: "  ", encoding: "UTF-8") do |xml|
       xml.element("MPD", "xmlns": "urn:mpeg:dash:schema:mpd:2011",
         "profiles": "urn:mpeg:dash:profile:full:2011", minBufferTime: "PT1.5S", type: "static",

src/invidious/routes/watch.cr

@@ -144,11 +144,6 @@ module Invidious::Routes::Watch
       end
     end
 
-    # Removes non default audio tracks
-    audio_streams.reject! do |z|
-      z if z.dig?("audioTrack", "audioIsDefault") == false
-    end
-
     # Older videos may not have audio sources available.
     # We redirect here so they're not unplayable
     if audio_streams.empty? && !video.live_now