settings_users: Fix the sorting of owner and admin in users list.
settings_users: Fix the sorting of owner and admin in users list.

We were not considering the owner role in `sort_role` function
which was leading to improper sorting when sorting the users
list according to role. This commit fixes this bug by considering
role in `sort_role` function.

punchagan/zulip,rht/zulip,zulip/zulip,kou/zulip,andersk/zulip,kou/zulip,hackerkid/zulip,rht/zulip,punchagan/zulip,eeshangarg/zulip,rht/zulip,hackerkid/zulip,rht/zulip,kou/zulip,eeshangarg/zulip,kou/zulip,zulip/zulip,kou/zulip,zulip/zulip,rht/zulip,andersk/zulip,hackerkid/zulip,eeshangarg/zulip,punchagan/zulip,zulip/zulip,rht/zulip,eeshangarg/zulip,zulip/zulip,kou/zulip,eeshangarg/zulip,eeshangarg/zulip,rht/zulip,punchagan/zulip,kou/zulip,andersk/zulip,hackerkid/zulip,andersk/zulip,andersk/zulip,andersk/zulip,zulip/zulip,andersk/zulip,zulip/zulip,punchagan/zulip,hackerkid/zulip,punchagan/zulip,eeshangarg/zulip,hackerkid/zulip,hackerkid/zulip,punchagan/zulip