DRYD-1447: Remove default values for dynamic term lists

[mikejritter]

What does this do?

• Removes default values for dynamic term lists

Why are we doing this? (with JIRA link)
Jira: https://collectionspace.atlassian.net/browse/DRYD-1447

A user is able to remove the default values from the sources (publishto and inventorystatus), which causes the display in the field to be invalid. Note - the ticket mentions recordStatus but that field is controlled by an option picker. I believe it was just a typo, and should have been publishTo.

How should this be tested? Do these changes have associated tests?

• Run the devserver, e.g. npm run devserver --back-end=https://core.dev.collectionspace.org
• Go to create a collectionobject and see that the Publish to and Inventory status fields do not have default values

Dependencies for merging? Releasing to production?
None

Has the application documentation been updated for these changes?
No

Did someone actually run this code to verify it works?
@mikejritter tested locally

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.18%. Comparing base (9ed0919) to head (c41be63).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #226   +/-   ##
=======================================
  Coverage   98.18%   98.18%           
=======================================
  Files         590      590           
  Lines       12679    12679           
  Branches     2593     2593           
=======================================
  Hits        12449    12449           
  Misses        227      227           
  Partials        3        3           

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[ray-lee]

Looks good.