various minor fixes to optical map

[ManuelHu]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.24%. Comparing base (96d4c6b) to head (d6f2584).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/reboost/__main__.py	0.00%	4 Missing ⚠️
src/reboost/optmap/__main__.py	0.00%	4 Missing ⚠️
src/reboost/optmap/convolve.py	66.66%	1 Missing ⚠️
src/reboost/optmap/mapview.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #143      +/-   ##
==========================================
+ Coverage   70.69%   71.24%   +0.55%     
==========================================
  Files          31       33       +2     
  Lines        2416     2424       +8     
==========================================
+ Hits         1708     1727      +19     
+ Misses        708      697      -11     

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