Fix popover adjustment on GitLab
Created by: chrismwendt
Removes old popover adjustment that was needed prior to https://github.com/sourcegraph/sourcegraph/pull/34859 when relativeElement was set to body. It's now undefined on code hosts, which causes the popover position to be calculated based on the window instead of body.
Before:
After:
The remaining gap will be fixed by https://github.com/sourcegraph/sourcegraph/pull/38511
Fixes https://github.com/sourcegraph/sourcegraph/issues/38464
Test plan
Ran locally
App preview:
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