More general filename filter for ascat soil moisture, allowing for Metop-B and Metop-C

[eysteinn]

Change restrictive file pattern that only allowed outdated Metop-A

[codecov]

Codecov Report

Merging #1983 (9d1ea31) into main (09e51f9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1983   +/-   ##
=======================================
  Coverage   93.53%   93.53%           
=======================================
  Files         279      279           
  Lines       41325    41325           
=======================================
  Hits        38655    38655           
  Misses       2670     2670           

Flag	Coverage Δ
behaviourtests	4.78% <ø> (ø)
unittests	94.07% <ø> (ø)

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[coveralls]

Coverage remained the same at 94.0% when pulling 9d1ea31 on eysteinn:master into 09e51f9 on pytroll:main.