[R/threadedComments] fix loading and saving xlsx with threadedComment. closes #131

[JanMarvin]

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[JanMarvin]

Codecov Report

Merging #132 (8a499be) into main (c12c347) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #132      +/-   ##
==========================================
- Coverage   61.34%   61.33%   -0.02%     
==========================================
  Files          38       38              
  Lines        7197     7195       -2     
==========================================
- Hits         4415     4413       -2     
  Misses       2782     2782              

Impacted Files	Coverage Δ
R/class-workbook.R	53.60% <100.00%> (-0.06%)	⬇️

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