fix: reduce_spatial

[clausmichele]

reduce_spatial was not working due to wrong parameters. I fixed it and added a test.

[codecov]

Codecov Report

Merging #164 (9a4c0e4) into main (2c72406) will increase coverage by 0.77%.
Report is 5 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #164      +/-   ##
==========================================
+ Coverage   79.66%   80.44%   +0.77%     
==========================================
  Files          29       29              
  Lines        1254     1268      +14     
==========================================
+ Hits          999     1020      +21     
+ Misses        255      248       -7     

Files	Coverage Δ
...esses_dask/process_implementations/cubes/reduce.py	95.65% <ø> (+17.39%)	⬆️

... and 4 files with indirect coverage changes

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[GeraldIr]

1 comment, otherwise lgtm.

[clausmichele]

@GeraldIr thanks, I fixed what you commented.