Bugfix: Export timeline doesn't correctly make side by side.
Description of change
Fixed the tracks creation, was messed up because of all metasequences.
How to test it
Export timeline with two or more tracks.
Checklist
Please check if your MR fulfills the following requirements:
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Unit tests have been added, if needed -
Documentation have been updated, if needed -
Build was run locally and any changes were pushed -
Lint has passed locally without error -
Package.py have been updated, if needed -
CHANGELOG.md have been updated, if needed -
Version numer has been tagged, if needed
FYI: @awesome_dev_too