Fix VIIRS EDR Active Fires reader for new format and fix fine/coarse 1D swath handling

[djhoese]

Apparently I never tested my last changes to this reader against real files. The instrument and satellite attribute names were not what I expected. This PR fixes them.

See ssec/polar2grid#458

• Closes Support new CSPP Active Fire I-Band Format ssec/polar2grid#458
• Tests added

[codecov]

Codecov Report

Merging #2210 (26b1988) into main (4baae95) will increase coverage by 0.00%.
The diff coverage is 92.85%.

@@           Coverage Diff           @@
##             main    #2210   +/-   ##
=======================================
  Coverage   94.14%   94.14%           
=======================================
  Files         294      294           
  Lines       45103    45108    +5     
=======================================
+ Hits        42461    42466    +5     
  Misses       2642     2642           

Flag	Coverage Δ
behaviourtests	4.67% <0.00%> (-0.01%)	⬇️
unittests	94.79% <92.85%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
satpy/readers/viirs_edr_active_fires.py	91.93% <50.00%> (ø)
satpy/scene.py	93.37% <100.00%> (+0.01%)	⬆️
.../tests/reader_tests/test_viirs_edr_active_fires.py	100.00% <100.00%> (ø)
satpy/tests/test_scene.py	99.49% <100.00%> (+<0.01%)	⬆️

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[coveralls]

Coverage increased (+0.0006%) to 94.743% when pulling 26b1988 on djhoese:bugix-viirsfires-sensor into 4baae95 on pytroll:main.

[mraspaud]

LGTM, but I would like a review from @adybbroe as I think he is already using this reader

[mraspaud]

OK, @adybbroe says we aren't using this, merging