settings_display: Change dev check to correct attribute.
settings_display: Change dev check to correct attribute.

For setting the night mode, it checks to see if you’re in development
by checking `page_params.development`, but the actual attribute is
`page_params.development_environment`.

eeshangarg/zulip,showell/zulip,timabbott/zulip,kou/zulip,eeshangarg/zulip,brainwane/zulip,jackrzhang/zulip,timabbott/zulip,synicalsyntax/zulip,shubhamdhama/zulip,rishig/zulip,eeshangarg/zulip,shubhamdhama/zulip,punchagan/zulip,timabbott/zulip,mahim97/zulip,shubhamdhama/zulip,hackerkid/zulip,zulip/zulip,timabbott/zulip,brainwane/zulip,shubhamdhama/zulip,hackerkid/zulip,mahim97/zulip,showell/zulip,timabbott/zulip,punchagan/zulip,rishig/zulip,dhcrzf/zulip,andersk/zulip,hackerkid/zulip,showell/zulip,rishig/zulip,kou/zulip,zulip/zulip,dhcrzf/zulip,tommyip/zulip,jackrzhang/zulip,shubhamdhama/zulip,dhcrzf/zulip,rht/zulip,jackrzhang/zulip,synicalsyntax/zulip,rht/zulip,dhcrzf/zulip,zulip/zulip,punchagan/zulip,zulip/zulip,hackerkid/zulip,synicalsyntax/zulip,kou/zulip,rht/zulip,showell/zulip,zulip/zulip,rht/zulip,timabbott/zulip,punchagan/zulip,showell/zulip,dhcrzf/zulip,brainwane/zulip,andersk/zulip,eeshangarg/zulip,andersk/zulip,showell/zulip,rishig/zulip,jackrzhang/zulip,synicalsyntax/zulip,jackrzhang/zulip,andersk/zulip,showell/zulip,shubhamdhama/zulip,synicalsyntax/zulip,andersk/zulip,rishig/zulip,eeshangarg/zulip,mahim97/zulip,andersk/zulip,eeshangarg/zulip,dhcrzf/zulip,rishig/zulip,synicalsyntax/zulip,rht/zulip,kou/zulip,kou/zulip,shubhamdhama/zulip,jackrzhang/zulip,brainwane/zulip,tommyip/zulip,synicalsyntax/zulip,zulip/zulip,rht/zulip,mahim97/zulip,eeshangarg/zulip,kou/zulip,brainwane/zulip,hackerkid/zulip,brainwane/zulip,punchagan/zulip,jackrzhang/zulip,mahim97/zulip,hackerkid/zulip,punchagan/zulip,kou/zulip,andersk/zulip,tommyip/zulip,tommyip/zulip,brainwane/zulip,rishig/zulip,tommyip/zulip,timabbott/zulip,zulip/zulip,hackerkid/zulip,mahim97/zulip,punchagan/zulip,tommyip/zulip,dhcrzf/zulip,rht/zulip,tommyip/zulip