GEOPY-2143: ensure backward compatibility of saved ui.json from Analyst 4.5 to 4.6

[domfournier]

GEOPY-2143 - ensure backward compatibility of saved ui.json from Analyst 4.5 to 4.6

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.47%. Comparing base (04a2d5a) to head (81145b3).
Report is 8 commits behind head on release/0.3.0.

Additional details and impacted files

@@              Coverage Diff               @@
##           release/0.3.0     #218   +/-   ##
==============================================
  Coverage          90.47%   90.47%           
==============================================
  Files                 85       85           
  Lines               4932     4934    +2     
  Branches             637      637           
==============================================
+ Hits                4462     4464    +2     
  Misses               308      308           
  Partials             162      162           

Files with missing lines	Coverage Δ
simpeg_drivers/potential_fields/gravity/options.py	100.00% <100.00%> (ø)

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