right-sidebar: Fix clicking between Users label and search icon.
right-sidebar: Fix clicking between Users label and search icon.

This brings the right sidebar UI to match the similar widget in the
left sidebar.  Since there's no other plausible effect for a click in
this whitespace, this small tweak should make using Zulip a bit more
convenient.

Fixes #8161.

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