Fix bug in assign_wcs.util.bounding_box_from_subarray function

[jdavies-st]

Subarray bounding boxes are now the correct size. Before they were 1 pixel too small.

Resolves #5542 / JP-1818

[codecov]

Codecov Report

Merging #5543 (b30d74b) into master (c129fee) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5543      +/-   ##
==========================================
+ Coverage   71.25%   71.26%   +0.01%     
==========================================
  Files         410      410              
  Lines       36426    36462      +36     
  Branches     5677     5683       +6     
==========================================
+ Hits        25954    25985      +31     
- Misses       8826     8831       +5     
  Partials     1646     1646              

Flag	Coverage Δ		*Carryforward flag
nightly	71.24% <0.00%> (ø)		Carriedforward from 8b06fea
unit	51.82% <100.00%> (ø)

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
jwst/assign_wcs/util.py	72.42% <100.00%> (+1.25%)	⬆️

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