navbar: Refactor >:nth-last-child(2) style to use scss nesting.
navbar: Refactor >:nth-last-child(2) style to use scss nesting.

showell/zulip,brainwane/zulip,showell/zulip,punchagan/zulip,brainwane/zulip,hackerkid/zulip,zulip/zulip,zulip/zulip,showell/zulip,rht/zulip,rht/zulip,eeshangarg/zulip,rht/zulip,andersk/zulip,punchagan/zulip,eeshangarg/zulip,brainwane/zulip,kou/zulip,rht/zulip,andersk/zulip,showell/zulip,andersk/zulip,kou/zulip,hackerkid/zulip,kou/zulip,eeshangarg/zulip,zulip/zulip,kou/zulip,showell/zulip,eeshangarg/zulip,eeshangarg/zulip,punchagan/zulip,eeshangarg/zulip,zulip/zulip,brainwane/zulip,hackerkid/zulip,zulip/zulip,zulip/zulip,punchagan/zulip,andersk/zulip,punchagan/zulip,rht/zulip,hackerkid/zulip,rht/zulip,brainwane/zulip,andersk/zulip,brainwane/zulip,kou/zulip,zulip/zulip,showell/zulip,eeshangarg/zulip,hackerkid/zulip,andersk/zulip,showell/zulip,punchagan/zulip,andersk/zulip,rht/zulip,punchagan/zulip,kou/zulip,kou/zulip,hackerkid/zulip,brainwane/zulip,hackerkid/zulip