Re-extrapolate values for particles entering the inflow zone

[LasNikas]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 12.50000% with 14 lines in your changes missing coverage. Please review.

Project coverage is 69.25%. Comparing base (cd617fe) to head (64ae36d).

Files with missing lines	Patch %	Lines
src/schemes/boundary/open_boundary/system.jl	6.66%	14 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #764      +/-   ##
==========================================
- Coverage   69.36%   69.25%   -0.12%     
==========================================
  Files         100      100              
  Lines        6421     6433      +12     
==========================================
+ Hits         4454     4455       +1     
- Misses       1967     1978      +11     

Flag	Coverage Δ
unit	69.25% <12.50%> (-0.12%)	:arrow_down:

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