Bugfix: Emphasized drawings preview not refreshed

Description of fix

Corrected area.type from "SEQUENCER" to "SEQUENCE_EDITOR".

How to test it

• Emphasize drawings

Checklist

Please check if your MR fulfills the following requirements:

• Build was run locally and any changes were pushed
• Lint has passed locally without error
• CHANGELOG.md has been updated
• Branch has been rebased on merge branch

FYI: @strangenoise