Fix reorder/parsons question selected item focus-outlines

[sjd210]

Currently a selected item will have its focus outline around the original item position, rather than the offset position used to indicate its selection.

This is because of an interaction with position: fixed causing the position of the item itself to not change while its children do. We can therefore just move the outline to the moved child to fix the visual issue.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.56%. Comparing base (2321dd9) to head (e4b1f3a).

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #2217    +/-   ##
========================================
  Coverage   43.56%   43.56%            
========================================
  Files         597      597            
  Lines       25217    25217            
  Branches     8355     7479   -876     
========================================
  Hits        10985    10985            
- Misses      14175    14183     +8     
+ Partials       57       49     -8     

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