[bug]: fix enum parsing in hictk CLI code

[robomics]

Fixes #331.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.70%. Comparing base (88c6384) to head (0dc175e).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #332      +/-   ##
==========================================
- Coverage   81.82%   81.70%   -0.12%     
==========================================
  Files         231      231              
  Lines       28169    28233      +64     
  Branches     3470     3478       +8     
==========================================
+ Hits        23050    23069      +19     
- Misses       3844     3886      +42     
- Partials     1275     1278       +3     

Flag	Coverage Δ
[tests	integration](https://app.codecov.io/gh/paulsengroup/hictk/pull/332/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)	67.83% <ø> (-0.11%)
[tests	unittests](https://app.codecov.io/gh/paulsengroup/hictk/pull/332/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)	81.77% <ø> (-0.03%)

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