Fix DeprecationWarning usage in min_area max_area deprecation

[ameraner]

Fix problem of Satpy crashing with warnings.DeprecationWarning wrong usage in min_area max_area deprecation

• Closes Crash when reaching warnings.DeprecationWarning #1573

[codecov]

Codecov Report

Merging #1576 (c17945d) into master (2969c14) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1576   +/-   ##
=======================================
  Coverage   92.54%   92.54%           
=======================================
  Files         251      251           
  Lines       36770    36770           
=======================================
  Hits        34027    34027           
  Misses       2743     2743           

Flag	Coverage Δ
behaviourtests	4.50% <ø> (ø)
unittests	92.68% <ø> (ø)

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Impacted Files	Coverage Δ
satpy/scene.py	91.65% <ø> (ø)

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[djhoese]

@mraspaud @pnuu @ameraner Do we need a test for this deprecation or do we just trust that it works now?

[mraspaud]

I'm good with leaving it like this.

[djhoese]

Thanks!