Hotfix 0.51

[h2]Changes and Improvements:[/h2]

• Additional optimization has been performed on the "Dead City" level.
  
• Fixed an issue where part of the image could disappear for a few seconds.
  
• The descriptions of collimator and sniper scopes have been updated to indicate that they are also compatible with Valmet 78.
  
• Lighting on the "Dead City" level has been partially adjusted.
  
• Fixed an issue with sniper scopes in the "Dead City".
  
• Slightly adjusted the physics of the Valmet 78 sniper rifle.
  
• Fixed a bug where an incomplete box of ammunition for the Valmet 78 was being sold on the Black Market.