Fix usage of FrankerFaceZ global emote API

[pajlada]

Pull request checklist:

• [x] CHANGELOG.md was updated, if applicable

Description

We no longer blindly parse all sets as global emotes, but rather match them against the default_sets as intended.

This means that some emotes will no longer be visible through Chatterino (e.g. AndKnuckles). This is more in line with how the FrankerFaceZ browser extension works.

Fixes #1116

[Mm2PL]

Sadge . o 0 ( AndKnuckles )

[pajlada]

Looks good to me!