Update Emoji version 4 to use original names
What does this MR do and why?
Goes back to some of the original naming of emoji fallback assets, compatible with V3. Such as thumbs_up.png
back to thumbsup.png
. V4 is not in use currently, so this update doesn't effect any running code.
These were originally added in Add emoji fallback images for V4 (!168446 - merged)
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Edited by Brett Walker