Fix 'Lint/UselessAssign' warnings reported by ameba

Author: SamantazFox

src/invidious/comments.cr

@@ -93,10 +93,6 @@ def fetch_youtube_comments(id, cursor, format, locale, thin_mode, region, sort_b
     end
     contents = body["contents"]?
     header = body["header"]?
-    if body["continuations"]?
-      # Removable? Doesn't seem like this is used.
-      more_replies_continuation = body["continuations"][0]["nextContinuationData"]["continuation"].as_s
-    end
   else
     raise InfoException.new("Could not fetch comments")
   end

src/invidious/playlists.cr

@@ -463,7 +463,6 @@ def extract_playlist_videos(initial_data : Hash(String, JSON::Any))
       plid = i["navigationEndpoint"]["watchEndpoint"]["playlistId"].as_s
       index = i["navigationEndpoint"]["watchEndpoint"]["index"].as_i64
 
-      thumbnail = i["thumbnail"]["thumbnails"][0]["url"].as_s
       title = i["title"].try { |t| t["simpleText"]? || t["runs"]?.try &.[0]["text"]? }.try &.as_s || ""
       author = i["shortBylineText"]?.try &.["runs"][0]["text"].as_s || ""
       ucid = i["shortBylineText"]?.try &.["runs"][0]["navigationEndpoint"]["browseEndpoint"]["browseId"].as_s || ""

src/invidious/users.cr

@@ -65,7 +65,6 @@ def fetch_user(sid, headers)
   feed = YT_POOL.client &.get("/subscription_manager?disable_polymer=1", headers)
   feed = XML.parse_html(feed.body)
 
-  channels = [] of String
   channels = feed.xpath_nodes(%q(//ul[@id="guide-channels"]/li/a)).compact_map do |channel|
     if {"Popular on YouTube", "Music", "Sports", "Gaming"}.includes? channel["title"]
       nil
@@ -157,12 +156,11 @@ def generate_captcha(key)
   </svg>
   END_SVG
 
-  image = ""
-  convert = Process.run(%(rsvg-convert -w 400 -h 400 -b none -f png), shell: true,
-    input: IO::Memory.new(clock_svg), output: Process::Redirect::Pipe) do |proc|
-    image = proc.output.gets_to_end
-    image = Base64.strict_encode(image)
-    image = "data:image/png;base64,#{image}"
+  image = "data:image/png;base64,"
+  image += Process.run(%(rsvg-convert -w 400 -h 400 -b none -f png), shell: true,
+    input: IO::Memory.new(clock_svg), output: Process::Redirect::Pipe
+  ) do |proc|
+    Base64.strict_encode(proc.output.gets_to_end)
   end
 
   answer = "#{hour}:#{minute.to_s.rjust(2, '0')}:#{second.to_s.rjust(2, '0')}"