"Frequently used Emoji" cookie needs a global path
We seem to not give the frequently_used_emoji
cookie an explicit path, so we end up with garbage like this:
![Screen_Shot_2016-07-29_at_11.08.09_AM](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)
We should probably just use /
for the path -- I want my frequently-used Emoji to be site-wide, not per-Issuable or per-project.