subscriptions.scss: Remove dead CSS.
subscriptions.scss: Remove dead CSS.

We remove css which has been dead since convertion of subscriptions
page to an overlay. This should ideally have been dealt with in
commit 1886f0a which actually did the converstion but we forgot to
handle it at that time.

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