fix z-index so category icons do not obscure labels
fix z-index so category icons do not obscure labels

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