Simplify redundant condition in Player.cpp

Signed-off-by: Cala <calaftp@free.fr>

(based on cmangos/mangos-wotlk@fb13d4a95)

Signed-off-by: Xfurry <xfurry.cmangos@outlook.com>

src/game/Player.cpp

@@ -11784,7 +11784,7 @@ void Player::UpdateItemDuration(uint32 time, bool realtimeonly)
         Item* item = *itr;
         ++itr;                                              // current element can be erased in UpdateDuration
 
-        if ((realtimeonly && (item->GetProto()->ExtraFlags & ITEM_EXTRA_REAL_TIME_DURATION)) || !realtimeonly)
+        if (!(realtimeonly) || (item->GetProto()->ExtraFlags & ITEM_EXTRA_REAL_TIME_DURATION))
             item->UpdateDuration(this, time);
     }
 }