Add Olympus E-M10 Mark IIIs alias

[kmilos]

Addresses https://github.com/darktable-org/darktable/issues/11803

Reviews also confirm these are identical wrt to sensor parameters, e.g. https://www.dpreview.com/news/0621457211/olympus-releases-the-lightly-updated-om-d-e-m10-mark-iiis

There is a sample on RPU and loads ok after this addition.

[codecov[bot]]

Codecov Report

Merging #362 (fad455d) into develop (626d5f6) will decrease coverage by 2.58%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #362      +/-   ##
===========================================
- Coverage    59.52%   56.94%   -2.59%     
===========================================
  Files          207      202       -5     
  Lines        12605    11923     -682     
  Branches      1766      286    -1480     
===========================================
- Hits          7503     6789     -714     
- Misses        4964     5004      +40     
+ Partials       138      130       -8     

Flag	Coverage Δ
integration	47.57% <ø> (ø)
rpu_u	47.57% <ø> (ø)
unittests	17.77% <ø> (-3.92%)	:arrow_down:

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

Impacted Files	Coverage Δ
test/librawspeed/common/RangeTest.cpp	21.73% <0.00%> (-78.27%)	:arrow_down:
...ibrawspeed/decompressors/BinaryHuffmanTreeTest.cpp	42.74% <0.00%> (-57.26%)	:arrow_down:
test/librawspeed/common/ChecksumFileTest.cpp	45.45% <0.00%> (-54.55%)	:arrow_down:
test/librawspeed/common/CpuidTest.cpp	50.00% <0.00%> (-50.00%)	:arrow_down:
test/librawspeed/metadata/CameraMetaDataTest.cpp	57.14% <0.00%> (-42.86%)	:arrow_down:
test/librawspeed/metadata/CameraTest.cpp	57.95% <0.00%> (-42.05%)	:arrow_down:
test/librawspeed/metadata/ColorFilterArrayTest.cpp	62.06% <0.00%> (-36.82%)	:arrow_down:
test/librawspeed/metadata/BlackAreaTest.cpp	63.63% <0.00%> (-36.37%)	:arrow_down:
...awspeed/decompressors/AbstractHuffmanTableTest.cpp	64.37% <0.00%> (-34.88%)	:arrow_down:
test/librawspeed/common/NORangesSetTest.cpp	69.04% <0.00%> (-30.96%)	:arrow_down:
... and 97 more

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[LebedevRI]

@kmilos thank you!