Fix boundaries

[kthyng]

Correction in a few built-in calculations of u/v grid to rho-grid interpolations of u and v velocities (currently speed and _uv2eastnorth). In these cases, we need to fill nans with zeros so that the masked locations in the velocity fields are not fully brought forward into the rho mask but are instead interpolated over. By making them 0, they are calculated into the mask_rho positions by combining them with neighboring cells. If this wasn't done, the fact that they are masked would supersede the neighboring cells and they would be masked in mask_rho. This needs to be done anytime the velocities are moved from their native grids to the rho or other grids to preserve their locations around masked cells.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.90%. Comparing base (0645c3e) to head (3f04e8b).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
xroms/accessor.py	66.66%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
- Coverage   83.93%   83.90%   -0.03%     
==========================================
  Files          17       17              
  Lines        1898     1901       +3     
==========================================
+ Hits         1593     1595       +2     
- Misses        305      306       +1     

Flag	Coverage Δ
unittests	83.90% <80.00%> (-0.03%)	⬇️

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