Refactor: remove DUEL_START deck_history object init

ygopro-server.coffee

@@ -3212,7 +3212,6 @@ ygopro.stoc_follow 'DUEL_START', true, (buffer, info, client, server, datas)->
   if client.main and client.main.length
     deck_text = '#ygopro-server deck log\n#main\n' + client.main.join('\n') + '\n!side\n' + client.side.join('\n') + '\n'
     room.decks[client.name] = deck_text unless room.decks[client.name]
-    room.deck_history = {} unless room.deck_history
     room.deck_history[client.name] = [] if !room.deck_history[client.name]
     room.deck_history[client.name].push deck_text
   if settings.modules.deck_log.enabled and deck_text and not client.deck_saved and not room.windbot

ygopro-server.js

@@ -4290,9 +4290,6 @@
       if (!room.decks[client.name]) {
         room.decks[client.name] = deck_text;
       }
-      if (!room.deck_history) {
-        room.deck_history = {};
-      }
       if (!room.deck_history[client.name]) {
         room.deck_history[client.name] = [];
       }