org settings: Fix background color in custom user profile datepicker field.
org settings: Fix background color in custom user profile datepicker field.

Fixes part of #11453

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