admin: Make restricted to domains checkbox readonly incase of no domains.
admin: Make restricted to domains checkbox readonly incase of no domains.

If there are no domains then there is no meaning of setting restricted to
domains checkbox and hence it should be disabled.

Fixes: #3436.

jainayush975/zulip,PhilSk/zulip,andersk/zulip,kou/zulip,mahim97/zulip,samatdav/zulip,brainwane/zulip,kou/zulip,souravbadami/zulip,aakash-cr7/zulip,amanharitsh123/zulip,verma-varsha/zulip,hackerkid/zulip,brockwhittaker/zulip,amanharitsh123/zulip,dhcrzf/zulip,amanharitsh123/zulip,timabbott/zulip,showell/zulip,vabs22/zulip,synicalsyntax/zulip,j831/zulip,blaze225/zulip,dawran6/zulip,mahim97/zulip,PhilSk/zulip,punchagan/zulip,kou/zulip,showell/zulip,jackrzhang/zulip,jainayush975/zulip,timabbott/zulip,andersk/zulip,brockwhittaker/zulip,rishig/zulip,christi3k/zulip,jackrzhang/zulip,dawran6/zulip,showell/zulip,ryanbackman/zulip,jackrzhang/zulip,rht/zulip,hackerkid/zulip,brainwane/zulip,dhcrzf/zulip,jrowan/zulip,punchagan/zulip,souravbadami/zulip,j831/zulip,ryanbackman/zulip,verma-varsha/zulip,kou/zulip,andersk/zulip,zulip/zulip,JPJPJPOPOP/zulip,eeshangarg/zulip,susansls/zulip,christi3k/zulip,brockwhittaker/zulip,shubhamdhama/zulip,dattatreya303/zulip,verma-varsha/zulip,PhilSk/zulip,susansls/zulip,dhcrzf/zulip,andersk/zulip,jackrzhang/zulip,ryanbackman/zulip,souravbadami/zulip,rht/zulip,j831/zulip,christi3k/zulip,hackerkid/zulip,synicalsyntax/zulip,jphilipsen05/zulip,jainayush975/zulip,vaidap/zulip,jphilipsen05/zulip,rishig/zulip,synicalsyntax/zulip,aakash-cr7/zulip,Galexrt/zulip,jphilipsen05/zulip,PhilSk/zulip,SmartPeople/zulip,zulip/zulip,jphilipsen05/zulip,shubhamdhama/zulip,tommyip/zulip,dhcrzf/zulip,andersk/zulip,eeshangarg/zulip,vaidap/zulip,JPJPJPOPOP/zulip,zulip/zulip,hackerkid/zulip,amanharitsh123/zulip,jainayush975/zulip,kou/zulip,hackerkid/zulip,jrowan/zulip,mahim97/zulip,mahim97/zulip,vabs22/zulip,synicalsyntax/zulip,andersk/zulip,dhcrzf/zulip,verma-varsha/zulip,jrowan/zulip,dattatreya303/zulip,rht/zulip,brainwane/zulip,rishig/zulip,sonali0901/zulip,punchagan/zulip,amanharitsh123/zulip,shubhamdhama/zulip,blaze225/zulip,souravbadami/zulip,samatdav/zulip,eeshangarg/zulip,punchagan/zulip,eeshangarg/zulip,shubhamdhama/zulip,JPJPJPOPOP/zulip,tommyip/zulip,brainwane/zulip,showell/zulip,dawran6/zulip,rht/zulip,sonali0901/zulip,ryanbackman/zulip,aakash-cr7/zulip,aakash-cr7/zulip,zulip/zulip,showell/zulip,eeshangarg/zulip,PhilSk/zulip,sonali0901/zulip,ryanbackman/zulip,dattatreya303/zulip,jainayush975/zulip,tommyip/zulip,JPJPJPOPOP/zulip,hackerkid/zulip,JPJPJPOPOP/zulip,tommyip/zulip,punchagan/zulip,brockwhittaker/zulip,christi3k/zulip,jackrzhang/zulip,vabs22/zulip,blaze225/zulip,tommyip/zulip,timabbott/zulip,timabbott/zulip,kou/zulip,dawran6/zulip,rishig/zulip,rht/zulip,Galexrt/zulip,aakash-cr7/zulip,vaidap/zulip,brockwhittaker/zulip,SmartPeople/zulip,kou/zulip,rht/zulip,timabbott/zulip,jrowan/zulip,eeshangarg/zulip,christi3k/zulip,timabbott/zulip,punchagan/zulip,blaze225/zulip,susansls/zulip,synicalsyntax/zulip,Galexrt/zulip,punchagan/zulip,rht/zulip,dattatreya303/zulip,verma-varsha/zulip,blaze225/zulip,j831/zulip,timabbott/zulip,susansls/zulip,j831/zulip,susansls/zulip,zulip/zulip,verma-varsha/zulip,showell/zulip,dhcrzf/zulip,mahim97/zulip,Galexrt/zulip,souravbadami/zulip,jphilipsen05/zulip,andersk/zulip,JPJPJPOPOP/zulip,dattatreya303/zulip,aakash-cr7/zulip,dawran6/zulip,synicalsyntax/zulip,vabs22/zulip,susansls/zulip,eeshangarg/zulip,SmartPeople/zulip,Galexrt/zulip,blaze225/zulip,rishig/zulip,amanharitsh123/zulip,SmartPeople/zulip,Galexrt/zulip,zulip/zulip,hackerkid/zulip,ryanbackman/zulip,mahim97/zulip,samatdav/zulip,j831/zulip,SmartPeople/zulip,souravbadami/zulip,jphilipsen05/zulip,Galexrt/zulip,vabs22/zulip,samatdav/zulip,dhcrzf/zulip,dattatreya303/zulip,jainayush975/zulip,jrowan/zulip,brockwhittaker/zulip,brainwane/zulip,vaidap/zulip,synicalsyntax/zulip,shubhamdhama/zulip,vaidap/zulip,tommyip/zulip,sonali0901/zulip,shubhamdhama/zulip,samatdav/zulip,vabs22/zulip,samatdav/zulip,zulip/zulip,showell/zulip,rishig/zulip,sonali0901/zulip,rishig/zulip,dawran6/zulip,jackrzhang/zulip,jackrzhang/zulip,PhilSk/zulip,SmartPeople/zulip,jrowan/zulip,shubhamdhama/zulip,tommyip/zulip,vaidap/zulip,brainwane/zulip,christi3k/zulip,brainwane/zulip,sonali0901/zulip