Use `env` in status-left evaluation
Use `env` in status-left evaluation

Makes $POWERLINE_COMMAND contents interpreted in the same fashion as in
status-right.

junix/powerline,prvnkumar/powerline,darac/powerline,xxxhycl2010/powerline,darac/powerline,areteix/powerline,darac/powerline,dragon788/powerline,IvanAli/powerline,Luffin/powerline,blindFS/powerline,cyrixhero/powerline,IvanAli/powerline,xxxhycl2010/powerline,junix/powerline,blindFS/powerline,blindFS/powerline,seanfisk/powerline,s0undt3ch/powerline,kenrachynski/powerline,EricSB/powerline,Liangjianghao/powerline,S0lll0s/powerline,dragon788/powerline,xfumihiro/powerline,QuLogic/powerline,dragon788/powerline,seanfisk/powerline,Luffin/powerline,Luffin/powerline,junix/powerline,DoctorJellyface/powerline,EricSB/powerline,cyrixhero/powerline,EricSB/powerline,s0undt3ch/powerline,areteix/powerline,kenrachynski/powerline,S0lll0s/powerline,QuLogic/powerline,xxxhycl2010/powerline,seanfisk/powerline,russellb/powerline,lukw00/powerline,xfumihiro/powerline,s0undt3ch/powerline,xfumihiro/powerline,lukw00/powerline,kenrachynski/powerline,DoctorJellyface/powerline,Liangjianghao/powerline,bezhermoso/powerline,bezhermoso/powerline,QuLogic/powerline,bezhermoso/powerline,Liangjianghao/powerline,cyrixhero/powerline,russellb/powerline,S0lll0s/powerline,lukw00/powerline,russellb/powerline,prvnkumar/powerline,IvanAli/powerline,DoctorJellyface/powerline,areteix/powerline,prvnkumar/powerline