test_alert_words: Use set comparisons for alert word sets.
test_alert_words: Use set comparisons for alert word sets.

This is important, because we're going to relax how fixed ordering is
with the migration away from a JSON list inside UserProfile.

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