Fix incorrect extents for DynamicAreaDefinition with 'modify_crs' antimeridian mode

[djhoese]

Test driven development doesn't help when your expected output is wrong.

• Closes #xxxx
• Tests added
• Tests passed
• Passes git diff origin/main **/*py | flake8 --diff
• Fully documented

[codecov]

Codecov Report

Merging #446 (93e0f3b) into main (6664669) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #446   +/-   ##
=======================================
  Coverage   94.21%   94.21%           
=======================================
  Files          68       68           
  Lines       12346    12349    +3     
=======================================
+ Hits        11632    11635    +3     
  Misses        714      714           

Flag	Coverage Δ
unittests	94.21% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pyresample/test/test_geometry.py	99.51% <ø> (ø)
pyresample/geometry.py	87.15% <100.00%> (+0.02%)	⬆️

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[coveralls]

Coverage increased (+0.001%) to 94.064% when pulling 93e0f3b on djhoese:bugfix-antimeridian-modify-crs into 6664669 on pytroll:main.

[mraspaud]

Lgtm