fix(zip): use ushort for ITaggedData.TagID

[Numpsy]

This is the TagId change from #470 split into a stand alone change.

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[codecov]

Codecov Report

Merging #669 (730f50f) into master (b5b1a92) will increase coverage by 0.24%.
The diff coverage is 0.00%.

@@ Coverage Diff @@## master #669 +/- ##
==========================================
+ Coverage 73.07% 73.31% +0.24% 
==========================================
Files 68 68 Lines 8305 8305 ==========================================
+ Hits 6069 6089 +20 + Misses 2236 2216 -20 

Impacted Files	Coverage Δ
src/ICSharpCode.SharpZipLib/Zip/ZipExtraData.cs	76.33% <0.00%> (ø)
...ode.SharpZipLib/Zip/Compression/DeflaterHuffman.cs	97.87% <0.00%> (+6.07%)	⬆️

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