Fix: Advanced drawing image sequences markers are not displayed as pending

Description of fix

Created Sequence.pending boolean set to True for temp advanced image drawings.

How to test it

• Draw a frame with advanced drawing.

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: @awesome_dev_too