Primarily bugfixes, addressing the distracting UI bug introduced the last build.

• Fixed bug causing Objectives Bar to constantly appear when pressing "E", completing "Eliminate High-Ranking Officer" objective
• Minor changes to scenery
• Fixed bug causing multiple corpses to appear from same enemy when killed by melee
• Made welding SFX stop when enemy is killed (Base entrance)
• Made Fade-To-Black transition slower when extracting by helicopter
• Fixed helicopter audio bug
• Fixed bug causing "Exit to Windows" button on in-game pause menu to load game instead of closing app