Fix ticking on the server

server/net/minecraft/src/BaseMod.java

@@ -39,7 +39,7 @@ public abstract class BaseMod implements cpw.mods.fml.common.modloader.BaseMod
         if (tick==TickType.WORLD && tickEnd) {
             return onTickInGame((MinecraftServer)minecraftInstance);
         } else {
-            return false;
+            return true;
         }
     }