Fix the sensor name for msu_gsa_l1b reader

[pnuu]

The sensor property is used to find for example the enhancement configuration files for the data. The original platform name MSU-GS/A doesn't work for this, as there is the / character that denotes a sub-directory in *NIX world. This PR changes the sensor name to "Pytroll standards".

[pnuu]

Oh. Should the whitespace be removed from the platform_name property? The current one would cause filename patterns like {start_time:%Y%m%d_%H%M}_{platform_name}_{areaname}_{productname}.{format} have a space in them.

[codecov]

Codecov Report

Merging #2016 (c41d378) into main (73ec5ad) will increase coverage by 0.30%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2016      +/-   ##
==========================================
+ Coverage   93.56%   93.87%   +0.30%     
==========================================
  Files         282      283       +1     
  Lines       41629    42380     +751     
==========================================
+ Hits        38952    39783     +831     
+ Misses       2677     2597      -80     

Flag	Coverage Δ
behaviourtests	4.72% <0.00%> (-0.06%)	⬇️
unittests	94.43% <100.00%> (+0.33%)	⬆️

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

Impacted Files	Coverage Δ
satpy/readers/msu_gsa_l1b.py	100.00% <100.00%> (ø)
satpy/tests/reader_tests/test_msu_gsa_l1b.py	100.00% <100.00%> (ø)
satpy/_compat.py	66.66% <0.00%> (-8.34%)	⬇️
satpy/tests/writer_tests/test_ninjogeotiff.py	96.52% <0.00%> (-1.18%)	⬇️
satpy/modifiers/_crefl.py	93.02% <0.00%> (-1.17%)	⬇️
satpy/modifiers/_crefl_utils.py	92.04% <0.00%> (-1.14%)	⬇️
satpy/tests/reader_tests/test_ahi_hsd.py	99.60% <0.00%> (-0.40%)	⬇️
satpy/readers/seviri_l1b_hrit.py	90.14% <0.00%> (-0.32%)	⬇️
satpy/readers/scmi.py	82.69% <0.00%> (-0.22%)	⬇️
satpy/readers/electrol_hrit.py	91.40% <0.00%> (-0.20%)	⬇️
... and 74 more

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[coveralls]

Coverage increased (+0.3%) to 94.372% when pulling c41d378 on pnuu:fix-msu_gsa-sensor-name into 73ec5ad on pytroll:main.

[pnuu]

I also replaced the space in platform_name with a dash to get nicer filenames when saving images.

[simonrp84]

Thanks for doing this @pnuu.
One thing, though - I set the platform name up like this because that's how it is for Electro-L:

SPACECRAFTS = {19001: "Electro-L N1",
               19002: "Electro-L N2",
               19003: "Electro-L N3"}

Should we also correct the names for that reader and, if so, maybe you could do it in this PR too?

[mraspaud]

@pnuu looks like you broke a test...

[mraspaud]

@pnuu ping :)

[pnuu]

Dang. Fixing in a bit.

[mraspaud]

LGTM