Remove calls with deprecated dir argument

[jcapriot]

Update internal calls to the make_boundary_bool function, changing dir to bdir

[codecov[bot]]

Codecov Report

Merging #312 (c758b05) into main (53002e1) will decrease coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #312      +/-   ##
==========================================
- Coverage   85.24%   85.23%   -0.02%     
==========================================
  Files          38       38              
  Lines       11301    11301              
==========================================
- Hits         9634     9632       -2     
- Misses       1667     1669       +2     

Impacted Files	Coverage Δ
discretize/base/base_tensor_mesh.py	88.18% <100.00%> (ø)
discretize/curvilinear_mesh.py	96.68% <100.00%> (ø)
discretize/operators/differential_operators.py	80.96% <100.00%> (ø)

... and 1 file with indirect coverage changes

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