Fix toggle_theme when visiting preferences with JS disabled

src/invidious.cr

@@ -1487,7 +1487,7 @@ end
 
 get "/toggle_theme" do |env|
   locale = LOCALES[env.get("preferences").as(Preferences).locale]?
-  referer = get_referer(env)
+  referer = get_referer(env, unroll: false)
 
   redirect = env.params.query["redirect"]?
   redirect ||= "true"

src/invidious/helpers/utils.cr

@@ -243,7 +243,7 @@ def make_host_url(config, kemal_config)
   return "#{scheme}#{host}#{port}"
 end
 
-def get_referer(env, fallback = "/")
+def get_referer(env, fallback = "/", unroll = true)
   referer = env.params.query["referer"]?
   referer ||= env.request.headers["referer"]?
   referer ||= fallback
@@ -251,6 +251,7 @@ def get_referer(env, fallback = "/")
   referer = URI.parse(referer)
 
   # "Unroll" nested referrers
+  if unroll
     loop do
       if referer.query
         params = HTTP::Params.parse(referer.query.not_nil!)
@@ -263,6 +264,7 @@ def get_referer(env, fallback = "/")
         break
       end
     end
+  end
 
   referer = referer.full_path
   referer = "/" + referer.lstrip("\/\\")