Fix syntax error in migration 820.
Fix syntax error in migration 820.

johancz/olympia,kmaglione/olympia,bqbn/addons-server,tsl143/addons-server,psiinon/addons-server,lavish205/olympia,kumar303/addons-server,andymckay/addons-server,koehlermichael/olympia,Witia1/olympia,magopian/olympia,jpetto/olympia,wagnerand/addons-server,mozilla/olympia,bqbn/addons-server,diox/olympia,beni55/olympia,Nolski/olympia,johancz/olympia,wagnerand/olympia,mstriemer/olympia,tsl143/addons-server,atiqueahmedziad/addons-server,wagnerand/olympia,crdoconnor/olympia,Nolski/olympia,muffinresearch/olympia,Witia1/olympia,diox/olympia,mdaif/olympia,mdaif/olympia,wagnerand/addons-server,aviarypl/mozilla-l10n-addons-server,tsl143/addons-server,johancz/olympia,mstriemer/addons-server,Nolski/olympia,eviljeff/olympia,mrrrgn/olympia,muffinresearch/addons-server,Witia1/olympia,Witia1/olympia,kmaglione/olympia,Prashant-Surya/addons-server,harry-7/addons-server,diox/olympia,atiqueahmedziad/addons-server,lavish205/olympia,wagnerand/addons-server,jpetto/olympia,mstriemer/olympia,Revanth47/addons-server,muffinresearch/olympia,koehlermichael/olympia,kmaglione/olympia,atiqueahmedziad/addons-server,aviarypl/mozilla-l10n-addons-server,Prashant-Surya/addons-server,crdoconnor/olympia,magopian/olympia,harry-7/addons-server,wagnerand/olympia,mozilla/addons-server,bqbn/addons-server,aviarypl/mozilla-l10n-addons-server,Prashant-Surya/addons-server,bqbn/addons-server,mdaif/olympia,jpetto/olympia,Prashant-Surya/addons-server,mozilla/addons-server,andymckay/addons-server,jpetto/olympia,psiinon/addons-server,diox/olympia,andymckay/olympia,psiinon/addons-server,kumar303/olympia,harikishen/addons-server,eviljeff/olympia,lavish205/olympia,andymckay/olympia,koehlermichael/olympia,wagnerand/olympia,mstriemer/olympia,mozilla/olympia,harikishen/addons-server,magopian/olympia,koehlermichael/olympia,muffinresearch/addons-server,mstriemer/addons-server,muffinresearch/olympia,andymckay/olympia,beni55/olympia,muffinresearch/addons-server,psiinon/addons-server,harry-7/addons-server,muffinresearch/olympia,beni55/olympia,muffinresearch/addons-server,magopian/olympia,muffinresearch/olympia,eviljeff/olympia,mdaif/olympia,yfdyh000/olympia,yfdyh000/olympia,eviljeff/olympia,crdoconnor/olympia,Revanth47/addons-server,mrrrgn/olympia,harikishen/addons-server,mozilla/olympia,andymckay/addons-server,kmaglione/olympia,mrrrgn/olympia,beni55/olympia,kumar303/olympia,crdoconnor/olympia,andymckay/olympia,yfdyh000/olympia,Nolski/olympia,mdaif/olympia,mozilla/addons-server,kumar303/addons-server,harry-7/addons-server,magopian/olympia,crdoconnor/olympia,koehlermichael/olympia,aviarypl/mozilla-l10n-addons-server,tsl143/addons-server,mrrrgn/olympia,mstriemer/addons-server,lavish205/olympia,mrrrgn/olympia,mozilla/addons-server,beni55/olympia,mstriemer/olympia,kumar303/olympia,Revanth47/addons-server,muffinresearch/addons-server,Nolski/olympia,kmaglione/olympia,kumar303/addons-server,mozilla/olympia,harikishen/addons-server,yfdyh000/olympia,Revanth47/addons-server,Witia1/olympia,kumar303/addons-server,atiqueahmedziad/addons-server,johancz/olympia,wagnerand/addons-server,yfdyh000/olympia,johancz/olympia,kumar303/olympia,mstriemer/addons-server,andymckay/addons-server