test_middleware: Remove night mode test.
test_middleware: Remove night mode test.

We removed the quoted string this test was for.

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