list_render test: Test reverse sorts.
list_render test: Test reverse sorts.

This also cleans up our `sort_button` helper
a bit.

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