cartesian: fix partition being transposed

[hhirtz]

Since we start with coord=1, Grid::part_of must also be called with coord=1, otherwise the partition array ends up being transposed.

[codecov]

Codecov Report

Base: 49.99% // Head: 43.76% // Decreases project coverage by -6.22% ⚠️

Coverage data is based on head (5c7dafe) compared to base (a8862c5).
Patch coverage: 25.00% of modified lines in pull request are covered.

❗ Current head 5c7dafe differs from pull request most recent head fb88706. Consider uploading reports for the commit fb88706 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #286      +/-   ##
==========================================
- Coverage   49.99%   43.76%   -6.23%     
==========================================
  Files          41       51      +10     
  Lines        7335     8685    +1350     
==========================================
+ Hits         3667     3801     +134     
- Misses       3668     4884    +1216     

Impacted Files	Coverage Δ
tools/num-part/src/database/mod.rs	0.00% <0.00%> (ø)
tools/src/lib.rs	0.18% <0.00%> (ø)
src/cartesian/mod.rs	85.06% <50.00%> (ø)
tools/src/bin/mesh-dup.rs	3.84% <0.00%> (ø)
tools/src/bin/apply-weight.rs	1.92% <0.00%> (ø)
tools/src/bin/mesh-refine.rs	2.22% <0.00%> (ø)
tools/src/bin/weight-gen.rs	25.94% <0.00%> (ø)
tools/src/bin/mesh-reorder.rs	1.31% <0.00%> (ø)
tools/src/bin/part-info.rs	0.45% <0.00%> (ø)
tools/src/bin/mesh-part.rs	39.59% <0.00%> (ø)
... and 3 more

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