Fix onion-skin re-entering state
What does this MR do?
Fixes a bug whereby a user can re-navigate to the onion-skin view and the slider would reset but not the opacity.
Are there points in the code the reviewer needs to double check?
None
Why was this MR needed?
~bug
Screenshots (if relevant)
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Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Tests added for this feature/bug - Review
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Has been reviewed by UX -
Has been reviewed by Frontend
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What are the relevant issue numbers?
Edited by Dimitrie Hoekstra