autocomplete and awardables emoji source alias inconsistencies

It seems our autocomplete dropdown :emoji_name... and the awardables dropdown have some inconsistencies. This seems to only be an issue with aliased emojis. I assume we are using different or unsynchronized emoji sources.

There is an awesome :sign_of_the_horns: 🤘 emoji. It is aliased as :metal: 🤘.

:metal: autocomplete

:metal: awardable

:sign_of_the_horns: autocomplete

:sign_of_the_horns: awardable

So you can see here that searching horn gives different results, sign_of_the_horns doesn't exist in our awardables sheet.

/cc @fatihacet