scroll hierarchy to selected concept instead of children

[osma]

Reasons for creating this PR

Follow-up fix to #1372. The scrolling was off if the concept has many descendants in the hierarchy. This PR adjusts the selector so that the scrolling ends up in the right position.

Link to relevant issue(s), if any

• follow-up to fix auto-scrolling and highlighting current concept in hierarchy #1372 and Issue1347 malihu custom scrollbar fix #1360

Description of the changes in this PR

• adjust jQuery selector used to determine auto-scroll position

Known problems or uncertainties in this PR

n/a

Checklist

• phpUnit tests pass locally with my changes
• I have added tests that show that the new code works, or tests are not relevant for this PR (e.g. only HTML/CSS changes)
• The PR doesn't reduce accessibility of the front-end code (e.g. tab focus, scaling to different resolutions, use of .sr-only class, color contrast)
• The PR doesn't introduce unintended code changes (e.g. empty lines or useless reindentation)

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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