Fix Adami boundary viscosity

[efaulhaber]

When using AdamiPressureExtrapolation, the velocity extrapolation was passing system_coords instead of v to current_velocity. This argument wasn't used for boundary systems, but for TLSPH, it did not work correctly.

This is on main:

The boundary layer is clearly smaller at the blade of the fin on the right, which is the integrated TLSPH part. The left are fixed particles, so wall viscosity is working correctly.

This PR:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.46%. Comparing base (cebef0c) to head (fcf780c).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #853      +/-   ##
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+ Coverage   70.38%   70.46%   +0.08%     
==========================================
  Files         106      106              
  Lines        6894     6894              
==========================================
+ Hits         4852     4858       +6     
+ Misses       2042     2036       -6     

Flag	Coverage Δ
unit	70.46% <100.00%> (+0.08%)	⬆️

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[svchb]

Can you add a test for compute_adami_density and compute_wall_velocity?

[efaulhaber]

Done.

[svchb]

/run-gpu-tests