create-zulip-admin: Fix shell quoting.
create-zulip-admin: Fix shell quoting.

Signed-off-by: Anders Kaseorg <087231934ba8fcf78bc142ce37d193b895ac03c4@mit.edu>

andersk/zulip,punchagan/zulip,brainwane/zulip,eeshangarg/zulip,zulip/zulip,shubhamdhama/zulip,hackerkid/zulip,eeshangarg/zulip,brainwane/zulip,hackerkid/zulip,showell/zulip,shubhamdhama/zulip,brainwane/zulip,timabbott/zulip,rht/zulip,rht/zulip,brainwane/zulip,synicalsyntax/zulip,timabbott/zulip,andersk/zulip,kou/zulip,hackerkid/zulip,punchagan/zulip,andersk/zulip,zulip/zulip,eeshangarg/zulip,showell/zulip,rht/zulip,brainwane/zulip,showell/zulip,hackerkid/zulip,rishig/zulip,rht/zulip,tommyip/zulip,synicalsyntax/zulip,timabbott/zulip,eeshangarg/zulip,timabbott/zulip,andersk/zulip,synicalsyntax/zulip,zulip/zulip,kou/zulip,showell/zulip,timabbott/zulip,shubhamdhama/zulip,tommyip/zulip,showell/zulip,rishig/zulip,shubhamdhama/zulip,zulip/zulip,punchagan/zulip,shubhamdhama/zulip,kou/zulip,andersk/zulip,hackerkid/zulip,showell/zulip,eeshangarg/zulip,brainwane/zulip,tommyip/zulip,hackerkid/zulip,rishig/zulip,rishig/zulip,punchagan/zulip,kou/zulip,zulip/zulip,rishig/zulip,eeshangarg/zulip,punchagan/zulip,timabbott/zulip,rht/zulip,hackerkid/zulip,tommyip/zulip,synicalsyntax/zulip,rishig/zulip,synicalsyntax/zulip,brainwane/zulip,shubhamdhama/zulip,tommyip/zulip,rishig/zulip,synicalsyntax/zulip,eeshangarg/zulip,andersk/zulip,tommyip/zulip,zulip/zulip,punchagan/zulip,punchagan/zulip,timabbott/zulip,tommyip/zulip,kou/zulip,rht/zulip,showell/zulip,shubhamdhama/zulip,rht/zulip,kou/zulip,synicalsyntax/zulip,kou/zulip,zulip/zulip,andersk/zulip