bugfix for kintree stencil creation

[aleaverfay]

Fixing a very small issue in the creation of scan orderings for leaf nodes in the FoldForest.

When processing the leaf-node exit-path assignment, (ie. j == n_conn +1), then whether an exit-path is available as one of the descendants does not matter, and thus it is usually preferable for CA to choose CB as its first child so it can build the side chain in the first path rather than e.g. C, where it would dead-end.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.35%. Comparing base (2cc46cd) to head (4277b53).
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #319      +/-   ##
==========================================
- Coverage   94.71%   94.35%   -0.37%     
==========================================
  Files         299      298       -1     
  Lines       20415    21598    +1183     
==========================================
+ Hits        19337    20378    +1041     
- Misses       1078     1220     +142     

Flag	Coverage Δ
_shrug_Testing_CPU	89.91% <100.00%> (-0.01%)	⬇️
_shrug_Testing_CPU_debug_w_o_jit	92.30% <100.00%> (+0.12%)	⬆️
_shrug_Testing_CUDA	91.95% <100.00%> (-0.50%)	⬇️

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