test_signup: Remove REALMS_HAVE_SUBDOMAINS check.
test_signup: Remove REALMS_HAVE_SUBDOMAINS check.

This test actually is just as correct with
REALMS_HAVE_SUBDOMAINS=True.

Galexrt/zulip,rishig/zulip,rishig/zulip,Galexrt/zulip,dhcrzf/zulip,brainwane/zulip,brockwhittaker/zulip,punchagan/zulip,eeshangarg/zulip,jackrzhang/zulip,hackerkid/zulip,brockwhittaker/zulip,showell/zulip,Galexrt/zulip,rishig/zulip,brainwane/zulip,shubhamdhama/zulip,Galexrt/zulip,synicalsyntax/zulip,eeshangarg/zulip,synicalsyntax/zulip,andersk/zulip,timabbott/zulip,brockwhittaker/zulip,synicalsyntax/zulip,andersk/zulip,tommyip/zulip,dhcrzf/zulip,brockwhittaker/zulip,rht/zulip,synicalsyntax/zulip,zulip/zulip,showell/zulip,jackrzhang/zulip,shubhamdhama/zulip,jackrzhang/zulip,zulip/zulip,tommyip/zulip,brainwane/zulip,hackerkid/zulip,rht/zulip,kou/zulip,dhcrzf/zulip,kou/zulip,timabbott/zulip,Galexrt/zulip,andersk/zulip,tommyip/zulip,shubhamdhama/zulip,brainwane/zulip,tommyip/zulip,synicalsyntax/zulip,rishig/zulip,brainwane/zulip,kou/zulip,eeshangarg/zulip,mahim97/zulip,mahim97/zulip,hackerkid/zulip,hackerkid/zulip,jackrzhang/zulip,hackerkid/zulip,zulip/zulip,andersk/zulip,rht/zulip,zulip/zulip,kou/zulip,tommyip/zulip,showell/zulip,jackrzhang/zulip,brockwhittaker/zulip,kou/zulip,andersk/zulip,rht/zulip,punchagan/zulip,andersk/zulip,shubhamdhama/zulip,punchagan/zulip,showell/zulip,zulip/zulip,dhcrzf/zulip,brockwhittaker/zulip,jackrzhang/zulip,showell/zulip,Galexrt/zulip,rht/zulip,eeshangarg/zulip,timabbott/zulip,zulip/zulip,shubhamdhama/zulip,rht/zulip,kou/zulip,mahim97/zulip,mahim97/zulip,Galexrt/zulip,shubhamdhama/zulip,dhcrzf/zulip,jackrzhang/zulip,tommyip/zulip,timabbott/zulip,synicalsyntax/zulip,hackerkid/zulip,synicalsyntax/zulip,rht/zulip,rishig/zulip,showell/zulip,timabbott/zulip,rishig/zulip,zulip/zulip,rishig/zulip,dhcrzf/zulip,eeshangarg/zulip,showell/zulip,mahim97/zulip,eeshangarg/zulip,punchagan/zulip,punchagan/zulip,brainwane/zulip,mahim97/zulip,hackerkid/zulip,shubhamdhama/zulip,timabbott/zulip,punchagan/zulip,punchagan/zulip,dhcrzf/zulip,kou/zulip,timabbott/zulip,tommyip/zulip,brainwane/zulip,andersk/zulip,eeshangarg/zulip