Handle sinergise mask renames

[jeremyh]

Sinergise rename mask files in their packaging, so the mask filenames inside the metadata are not correct.

[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.

Project coverage is 84.72%. Comparing base (f2117dd) to head (9858300).
Report is 17 commits behind head on develop.

Files with missing lines	Patch %	Lines
eodatasets3/wagl.py	42.85%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #372      +/-   ##
===========================================
+ Coverage    84.44%   84.72%   +0.28%     
===========================================
  Files           26       26              
  Lines         4506     4531      +25     
===========================================
+ Hits          3805     3839      +34     
+ Misses         701      692       -9     

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