settings: Remove useless duplicated margin-top.
settings: Remove useless duplicated margin-top.

We only needed this margin for the "filter settings" CSS, and it
doesn't take effect anyway due to CSS precedence.

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