fix(tar): create translated files in temp

[piksel]

In #622 the temporary file path was changed to use Path.GetRandomFileName() instead of Path.GetTempFileName(), which resulted in the current working directory being used for storing the translated tar files while creating archives.
This instead uses the PathUtils.GetTempFileName() that was created for this purpose.

Fixes #644

[codecov]

Codecov Report

Merging #645 (dcf5e10) into master (8c0a169) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #645   +/-   ##
=======================================
  Coverage   73.30%   73.30%           
=======================================
  Files          68       68           
  Lines        8309     8309           
=======================================
  Hits         6091     6091           
  Misses       2218     2218           

Impacted Files	Coverage Δ
src/ICSharpCode.SharpZipLib/Core/PathUtils.cs	100.00% <ø> (ø)
src/ICSharpCode.SharpZipLib/Tar/TarArchive.cs	43.12% <0.00%> (ø)

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