Fix roadmap settings drawer offset height
What does this MR do and why?
Calculate height to offset top of roadmap settings drawer when it opens instead of when it is mounted to the dom.
MR acceptance checklist
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Screenshots or screen recordings
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How to set up and validate locally
- Check out this branch locally
- Visit a group Roadmap page
- open the settings
you will see that the settings drawer has the correct height
Related to #462343 (closed)
Related to #452225
Edited by Chad Lavimoniere