graphql: Look up custom emoji in root group
Users should1 be able to only add custom emoji to a root group, so when custom emoji for a subgroup are requested, the custom emoji for it's root group should be returned.
Use CustomEmoji.for_resource to resolve custom emoji, as this scope already takes care of finding the root group.
Label: bug::functional Issue: #426399 (closed)
Edited by Toon Claes