Change in GUI MIX field name from mimetype to format name

[samalloing]

Hi @carlwilson

The GUI shows Mimetype for MIX image data, according to the specifications this should be Format Name. The export in txt and XML show the correct field, but the GUI of jHove showed the wrong field name. Fixes #896

Sam

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.00%. Comparing base (7f090b6) to head (5ea5467).
Report is 1 commits behind head on integration.

Additional details and impacted files

@@              Coverage Diff               @@
##             integration     #899   +/-   ##
==============================================
  Coverage          47.00%   47.00%           
  Complexity          1100     1100           
==============================================
  Files                 57       57           
  Lines               9079     9079           
  Branches            1622     1622           
==============================================
  Hits                4268     4268           
  Misses              4280     4280           
  Partials             531      531           

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[leninoc]

hi, thanks for including this fix.
The fix covers PDF, PNG, GIF, JPEG, JPEG2000 and TIFF modules - I thought I would make it clear here, someone might need this detail later on, thanks!