emoji refactor: Avoid util dep with minor hack.
emoji refactor: Avoid util dep with minor hack.

We copy in a one-line function from util that
will soon be replaced with lodash.

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