Remove unnecessary proj4 argument parsing from get_area_def

[djhoese]

Removes an unnecessary and likely unused PROJ.4 string -> dict conversion in get_area_def. See #547 for more info.

• [x] Closes #547
• [ ] Tests added
• [ ] Tests passed
• [ ] Passes git diff origin/main **/*py | flake8 --diff
• [ ] Fully documented

[codecov[bot]]

Codecov Report

Merging #548 (0c6289b) into main (ba09e7d) will decrease coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #548      +/-   ##
==========================================
- Coverage   94.25%   94.25%   -0.01%     
==========================================
  Files          82       82              
  Lines       13077    13076       -1     
==========================================
- Hits        12326    12325       -1     
  Misses        751      751              

Flag	Coverage Δ
unittests	94.25% <100.00%> (-0.01%)	:arrow_down:

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

Files	Coverage Δ
pyresample/area_config.py	90.55% <100.00%> (-0.03%)	:arrow_down:

[coveralls]

coverage: 93.832% (-0.001%) from 93.833% when pulling 0c6289bf08c83ccc6bcadd85584e98843c8c232a on djhoese:feat-proj4-args-get-area into ba09e7d5cb1f78518bd24955b6b24681998e8c76 on pytroll:main.