Make logger a constant

Instead of passing around `logger` there is now the global `LOGGER`.

src/invidious/routes/base_route.cr

@@ -1,7 +1,6 @@
 abstract class Invidious::Routes::BaseRoute
   private getter config : Config
-  private getter logger : Invidious::LogHandler
 
-  def initialize(@config, @logger)
+  def initialize(@config)
   end
 end

src/invidious/routes/login.cr

@@ -267,7 +267,7 @@ class Invidious::Routes::Login < Invidious::Routes::BaseRoute
           raise "Couldn't get SID."
         end
 
-        user, sid = get_user(sid, headers, PG_DB, logger)
+        user, sid = get_user(sid, headers, PG_DB)
 
         # We are now logged in
         traceback << "done.<br/>"

src/invidious/routes/watch.cr

@@ -62,7 +62,7 @@ class Invidious::Routes::Watch < Invidious::Routes::BaseRoute
     rescue ex : VideoRedirect
       return env.redirect env.request.resource.gsub(id, ex.video_id)
     rescue ex
-      logger.error("get_video: #{id} : #{ex.message}")
+      LOGGER.error("get_video: #{id} : #{ex.message}")
       return error_template(500, ex)
     end