forms.py: Remove unused function get_registration_string(domain).
forms.py: Remove unused function get_registration_string(domain).

hackerkid/zulip,SmartPeople/zulip,JPJPJPOPOP/zulip,j831/zulip,dawran6/zulip,ryanbackman/zulip,zulip/zulip,synicalsyntax/zulip,j831/zulip,brockwhittaker/zulip,punchagan/zulip,souravbadami/zulip,jrowan/zulip,synicalsyntax/zulip,brockwhittaker/zulip,PhilSk/zulip,rishig/zulip,tommyip/zulip,jackrzhang/zulip,dawran6/zulip,showell/zulip,eeshangarg/zulip,Galexrt/zulip,jphilipsen05/zulip,jphilipsen05/zulip,eeshangarg/zulip,vaidap/zulip,zulip/zulip,punchagan/zulip,zulip/zulip,JPJPJPOPOP/zulip,christi3k/zulip,rht/zulip,jackrzhang/zulip,synicalsyntax/zulip,SmartPeople/zulip,JPJPJPOPOP/zulip,dhcrzf/zulip,rht/zulip,brainwane/zulip,mahim97/zulip,hackerkid/zulip,souravbadami/zulip,dhcrzf/zulip,dhcrzf/zulip,brockwhittaker/zulip,aakash-cr7/zulip,PhilSk/zulip,PhilSk/zulip,rht/zulip,jphilipsen05/zulip,SmartPeople/zulip,souravbadami/zulip,kou/zulip,showell/zulip,kou/zulip,brainwane/zulip,shubhamdhama/zulip,JPJPJPOPOP/zulip,vaidap/zulip,brockwhittaker/zulip,rht/zulip,verma-varsha/zulip,timabbott/zulip,shubhamdhama/zulip,eeshangarg/zulip,Galexrt/zulip,amanharitsh123/zulip,verma-varsha/zulip,SmartPeople/zulip,Galexrt/zulip,andersk/zulip,jackrzhang/zulip,timabbott/zulip,shubhamdhama/zulip,andersk/zulip,tommyip/zulip,mahim97/zulip,synicalsyntax/zulip,jainayush975/zulip,andersk/zulip,vabs22/zulip,zulip/zulip,showell/zulip,ryanbackman/zulip,mahim97/zulip,jrowan/zulip,jackrzhang/zulip,brainwane/zulip,ryanbackman/zulip,tommyip/zulip,jrowan/zulip,JPJPJPOPOP/zulip,jrowan/zulip,rht/zulip,jainayush975/zulip,susansls/zulip,PhilSk/zulip,jainayush975/zulip,punchagan/zulip,Galexrt/zulip,shubhamdhama/zulip,rishig/zulip,PhilSk/zulip,susansls/zulip,vaidap/zulip,zulip/zulip,timabbott/zulip,christi3k/zulip,PhilSk/zulip,zulip/zulip,kou/zulip,jrowan/zulip,dawran6/zulip,jackrzhang/zulip,brockwhittaker/zulip,vabs22/zulip,rht/zulip,hackerkid/zulip,showell/zulip,JPJPJPOPOP/zulip,dawran6/zulip,shubhamdhama/zulip,vabs22/zulip,rishig/zulip,brainwane/zulip,mahim97/zulip,dawran6/zulip,kou/zulip,zulip/zulip,jphilipsen05/zulip,jphilipsen05/zulip,timabbott/zulip,kou/zulip,christi3k/zulip,j831/zulip,hackerkid/zulip,punchagan/zulip,aakash-cr7/zulip,susansls/zulip,susansls/zulip,punchagan/zulip,SmartPeople/zulip,j831/zulip,kou/zulip,timabbott/zulip,jrowan/zulip,aakash-cr7/zulip,Galexrt/zulip,rht/zulip,tommyip/zulip,hackerkid/zulip,dhcrzf/zulip,showell/zulip,ryanbackman/zulip,jphilipsen05/zulip,j831/zulip,amanharitsh123/zulip,synicalsyntax/zulip,brainwane/zulip,tommyip/zulip,mahim97/zulip,aakash-cr7/zulip,timabbott/zulip,ryanbackman/zulip,aakash-cr7/zulip,christi3k/zulip,jainayush975/zulip,andersk/zulip,synicalsyntax/zulip,hackerkid/zulip,verma-varsha/zulip,souravbadami/zulip,Galexrt/zulip,ryanbackman/zulip,susansls/zulip,showell/zulip,andersk/zulip,rishig/zulip,vaidap/zulip,verma-varsha/zulip,eeshangarg/zulip,brockwhittaker/zulip,tommyip/zulip,rishig/zulip,SmartPeople/zulip,aakash-cr7/zulip,dhcrzf/zulip,christi3k/zulip,jainayush975/zulip,souravbadami/zulip,dhcrzf/zulip,synicalsyntax/zulip,verma-varsha/zulip,rishig/zulip,souravbadami/zulip,verma-varsha/zulip,showell/zulip,jackrzhang/zulip,christi3k/zulip,vabs22/zulip,eeshangarg/zulip,amanharitsh123/zulip,punchagan/zulip,amanharitsh123/zulip,brainwane/zulip,mahim97/zulip,andersk/zulip,vaidap/zulip,shubhamdhama/zulip,shubhamdhama/zulip,vaidap/zulip,tommyip/zulip,vabs22/zulip,j831/zulip,eeshangarg/zulip,dawran6/zulip,jainayush975/zulip,kou/zulip,punchagan/zulip,timabbott/zulip,amanharitsh123/zulip,vabs22/zulip,jackrzhang/zulip,Galexrt/zulip,andersk/zulip,brainwane/zulip,hackerkid/zulip,amanharitsh123/zulip,susansls/zulip,rishig/zulip,eeshangarg/zulip,dhcrzf/zulip