Fix failing test on environment variable
Fix failing test on environment variable

Once an ENV is set in a previous test, it must be explicitly set
to nil, otherwise it keeps its value.

CodesScripts/yt,Vydia/yt,shredder-rull/yt,Fullscreen/yt,hellaxe/yt,bohdan-malets/yt,mhui/yt,jacknguyen/yt,amalagaura/yt,claudiofullscreen/yt