fix undefined variable in LESS file
fix undefined variable in LESS file

ddurst/zamboni,elysium001/zamboni,atiqueahmedziad/addons-server,mudithkr/zamboni,Joergen/olympia,robhudson/zamboni,Joergen/zamboni,kumar303/olympia,wagnerand/addons-server,yfdyh000/olympia,magopian/olympia,mstriemer/olympia,diox/olympia,anaran/olympia,bqbn/addons-server,tsl143/addons-server,kmaglione/olympia,SuriyaaKudoIsc/olympia,luckylavish/zamboni,beni55/olympia,clouserw/zamboni,Revanth47/addons-server,Jobava/zamboni,mstriemer/addons-server,lavish205/olympia,diox/zamboni,wagnerand/addons-server,andymckay/olympia,ddurst/zamboni,ayushagrawal288/zamboni,tsl143/addons-server,mstriemer/olympia,jamesthechamp/zamboni,jasonthomas/zamboni,diox/olympia,johancz/olympia,Hitechverma/zamboni,crdoconnor/olympia,wagnerand/olympia,muffinresearch/olympia,Prashant-Surya/addons-server,luckylavish/zamboni,diox/zamboni,kmaglione/olympia,Witia1/olympia,eviljeff/olympia,shahbaz17/zamboni,wagnerand/olympia,kumar303/olympia,muffinresearch/addons-server,wagnerand/zamboni,mudithkr/zamboni,spasovski/zamboni,eviljeff/zamboni,tsl143/addons-server,kumar303/addons-server,jamesthechamp/zamboni,mdaif/olympia,ngokevin/zamboni,aviarypl/mozilla-l10n-addons-server,Witia1/olympia,clouserw/zamboni,kumar303/olympia,atiqueahmedziad/addons-server,koehlermichael/olympia,mudithkr/zamboni,Nolski/olympia,mozilla/addons-server,yfdyh000/olympia,Hitechverma/zamboni,wagnerand/addons-server,washort/zamboni,mozilla/zamboni,yfdyh000/olympia,kumar303/addons-server,kumar303/zamboni,koehlermichael/olympia,mozilla/addons-server,koehlermichael/olympia,tsl143/zamboni,SuriyaaKudoIsc/olympia,ayushagrawal288/zamboni,elysium001/zamboni,muffinresearch/olympia,mstriemer/addons-server,crdoconnor/olympia,elysium001/zamboni,Jobava/zamboni,muffinresearch/addons-server,wagnerand/olympia,muffinresearch/olympia,mozilla/addons-server,tsl143/zamboni,mozilla/olympia,tsl143/zamboni,beni55/olympia,lavish205/olympia,Revanth47/addons-server,andymckay/addons-server,magopian/olympia,kmaglione/olympia,Nolski/olympia,mdaif/olympia,eviljeff/zamboni,wagnerand/addons-server,andymckay/addons-server,mozilla/addons-server,Joergen/zamboni,magopian/olympia,Nolski/olympia,Witia1/olympia,kumar303/olympia,bqbn/addons-server,ngokevin/zamboni,wagnerand/zamboni,luckylavish/zamboni,andymckay/olympia,jpetto/olympia,harry-7/addons-server,kumar303/zamboni,jasonthomas/zamboni,mstriemer/zamboni,anaran/olympia,diox/olympia,johancz/olympia,harry-7/addons-server,shahbaz17/zamboni,kumar303/addons-server,spasovski/zamboni,aviarypl/mozilla-l10n-addons-server,muffinresearch/addons-server,eviljeff/olympia,harry-7/addons-server,ingenioustechie/zamboni,andymckay/olympia,muffinresearch/olympia,harry-7/addons-server,mstriemer/olympia,Joergen/zamboni,tsl143/zamboni,psiinon/addons-server,Prashant-Surya/addons-server,bqbn/addons-server,washort/zamboni,koehlermichael/olympia,mudithkr/zamboni,aviarypl/mozilla-l10n-addons-server,robhudson/zamboni,atiqueahmedziad/addons-server,magopian/olympia,mdaif/olympia,ayushagrawal288/zamboni,mrrrgn/olympia,shahbaz17/zamboni,Prashant-Surya/addons-server,jasonthomas/zamboni,jasonthomas/zamboni,kmaglione/olympia,mrrrgn/olympia,harikishen/addons-server,Joergen/olympia,tsl143/addons-server,andymckay/zamboni,ingenioustechie/zamboni,mozilla/zamboni,eviljeff/olympia,harikishen/addons-server,mozilla/olympia,magopian/olympia,Prashant-Surya/addons-server,mstriemer/addons-server,beni55/olympia,beni55/olympia,kmaglione/olympia,kumar303/addons-server,robhudson/zamboni,ingenioustechie/zamboni,atiqueahmedziad/addons-server,mstriemer/zamboni,muffinresearch/olympia,anaran/olympia,washort/zamboni,eviljeff/olympia,harikishen/addons-server,jpetto/olympia,muffinresearch/addons-server,bqbn/addons-server,wagnerand/olympia,mdaif/olympia,spasovski/zamboni,mrrrgn/olympia,psiinon/addons-server,mstriemer/zamboni,jamesthechamp/zamboni,psiinon/addons-server,ddurst/zamboni,yfdyh000/olympia,mstriemer/addons-server,andymckay/olympia,Jobava/zamboni,mstriemer/olympia,crdoconnor/olympia,ngokevin/zamboni,Nolski/olympia,Nolski/olympia,lavish205/olympia,andymckay/addons-server,Joergen/olympia,ddurst/zamboni,Hitechverma/zamboni,Jobava/zamboni,psiinon/addons-server,harikishen/addons-server,jpetto/olympia,jamesthechamp/zamboni,Joergen/zamboni,johancz/olympia,johancz/olympia,diox/zamboni,koehlermichael/olympia,anaran/olympia,yfdyh000/olympia,Joergen/zamboni,muffinresearch/addons-server,diox/olympia,beni55/olympia,crdoconnor/olympia,Joergen/olympia,aviarypl/mozilla-l10n-addons-server,washort/zamboni,Witia1/olympia,johancz/olympia,kumar303/zamboni,Joergen/zamboni,mozilla/zamboni,andymckay/zamboni,mozilla/olympia,wagnerand/zamboni,clouserw/zamboni,elysium001/zamboni,SuriyaaKudoIsc/olympia,mozilla/zamboni,eviljeff/zamboni,Revanth47/addons-server,SuriyaaKudoIsc/olympia,Hitechverma/zamboni,mozilla/olympia,crdoconnor/olympia,eviljeff/zamboni,jpetto/olympia,kumar303/zamboni,lavish205/olympia,Witia1/olympia,mstriemer/zamboni,mrrrgn/olympia,andymckay/zamboni,wagnerand/zamboni,Joergen/olympia,clouserw/zamboni,shahbaz17/zamboni,mrrrgn/olympia,ingenioustechie/zamboni,diox/zamboni,Revanth47/addons-server,spasovski/zamboni,mdaif/olympia,andymckay/addons-server,robhudson/zamboni,ayushagrawal288/zamboni,luckylavish/zamboni