fix: correct XML attribute name for after auto-spacing.

[doublemix]

Specifying true for ISpacingProperties.afterAutoSpacing is not working, but ISpacingProperties.beforeAutoSpacing is.

It seems to be caused by an incorrectly cased XML property name.

Local testing shows that this change allows after auto-spacing to be applied correctly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (b1f6765) to head (8a47a5e).
Report is 11 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2975   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          287       287           
  Lines         8387      8387           
  Branches      1410      1410           
=========================================
  Hits          8387      8387           

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