Commented Unassigned: IPatternFormatting.FillPattern should be of type FillPattern, not short [13973]

Looks like I missed at least once place when I revamped the API a while back, fixing all of the 'short' and 'int' properties to be the appropriate enum types instead.

I just noticed that I missed IPatternFormatting.FillPattern.
Comments: ** Comment from web user: jstedfast **

I've submitted a PR to fix this here: https://github.com/tonyqus/npoi/pull/98