refactor: use reverse! and uniq! to modify the array in place

src/invidious/routes/api/v1/authenticated.cr

@@ -482,7 +482,7 @@ module Invidious::Routes::API::V1::Authenticated
     env.response.content_type = "text/event-stream"
 
     raw_topics = env.params.body["topics"]? || env.params.query["topics"]?
-    topics = raw_topics.try &.split(",").uniq.first(1000)
+    topics = raw_topics.try &.split(",").uniq!.first(1000)
     topics ||= [] of String
 
     create_notification_stream(env, topics, CONNECTION_CHANNEL)

src/invidious/yt_backend/youtube_api.cr

@@ -724,7 +724,7 @@ module YoutubeAPI
       # Multiple encodings can be combined, and are listed in the order
       # in which they were applied. E.g: "deflate, gzip" means that the
       # content must be first "gunzipped", then "defated".
-      encodings.split(',').reverse.each do |enc|
+      encodings.split(',').reverse!.each do |enc|
         case enc.strip(' ')
         when "gzip"
           body_io = Compress::Gzip::Reader.new(body_io, sync_close: true)