node: Fix ui_init test failing due to night_mode initialization.
node: Fix ui_init test failing due to night_mode initialization.

This was a rebase conflict between the new test and the extraction of
an initialization method for night_mode.

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