Fix to use DependencyPropertyAttribute

[y-iihoshi]

Closes #417.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (e7ba961) 81.90% compared to head (3e132d7) 81.58%.

Files	Patch %	Lines
...nverter/Interactivity/FolderBrowserDialogAction.cs	66.66%	0 Missing and 1 partial ⚠️
...oreFileConverter/Interactivity/FontDialogAction.cs	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #418      +/-   ##
==========================================
- Coverage   81.90%   81.58%   -0.32%     
==========================================
  Files         472      471       -1     
  Lines       16367    16094     -273     
  Branches     1250     1252       +2     
==========================================
- Hits        13405    13130     -275     
  Misses       2879     2879              
- Partials       83       85       +2     

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