topic_edit_form: Update styling of topic edit form.
topic_edit_form: Update styling of topic edit form.

Updated the CSS a bit so that it matches with other inputs.

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