Add missing argument to get_tmux_output
Add missing argument to get_tmux_output

Fixes #1097
QuLogic/powerline,seanfisk/powerline,cyrixhero/powerline,QuLogic/powerline,kenrachynski/powerline,areteix/powerline,junix/powerline,darac/powerline,kenrachynski/powerline,russellb/powerline,Liangjianghao/powerline,s0undt3ch/powerline,S0lll0s/powerline,bezhermoso/powerline,Liangjianghao/powerline,Liangjianghao/powerline,blindFS/powerline,wfscheper/powerline,prvnkumar/powerline,lukw00/powerline,areteix/powerline,wfscheper/powerline,xxxhycl2010/powerline,seanfisk/powerline,firebitsbr/powerline,seanfisk/powerline,prvnkumar/powerline,bezhermoso/powerline,junix/powerline,firebitsbr/powerline,xfumihiro/powerline,wfscheper/powerline,junix/powerline,DoctorJellyface/powerline,blindFS/powerline,blindFS/powerline,bartvm/powerline,cyrixhero/powerline,darac/powerline,Luffin/powerline,russellb/powerline,bezhermoso/powerline,xfumihiro/powerline,EricSB/powerline,dragon788/powerline,Luffin/powerline,EricSB/powerline,bartvm/powerline,dragon788/powerline,firebitsbr/powerline,IvanAli/powerline,xxxhycl2010/powerline,russellb/powerline,s0undt3ch/powerline,xxxhycl2010/powerline,lukw00/powerline,prvnkumar/powerline,lukw00/powerline,Luffin/powerline,S0lll0s/powerline,S0lll0s/powerline,s0undt3ch/powerline,cyrixhero/powerline,xfumihiro/powerline,EricSB/powerline,kenrachynski/powerline,dragon788/powerline,DoctorJellyface/powerline,areteix/powerline,IvanAli/powerline,IvanAli/powerline,darac/powerline,bartvm/powerline,QuLogic/powerline,DoctorJellyface/powerline