fix typo

ygopro-server.coffee

@@ -1389,7 +1389,7 @@ ygopro.stoc_follow 'DUEL_START', false, (buffer, info, client, server)->
     else if room.random_type == 'S'
       deck_arena = deck_arena + 'entertain'
     else if room.random_type == 'M'
-      deck_arena = deck_arena + 'atheletic'
+      deck_arena = deck_arena + 'athletic'
     else
       deck_arena = deck_arena + 'custom'
     #log.info "DECK LOG START", client.name, room.arena

ygopro-server.js

@@ -1705,7 +1705,7 @@
       } else if (room.random_type === 'S') {
         deck_arena = deck_arena + 'entertain';
       } else if (room.random_type === 'M') {
-        deck_arena = deck_arena + 'atheletic';
+        deck_arena = deck_arena + 'athletic';
       } else {
         deck_arena = deck_arena + 'custom';
       }