Temporary fix for formio-builder

[robinmolen]

Part of #2173

Changes

The formio-builder, in the tests, expects a new property. This will be added with map background PR (#4881).

Without this property, the form won't render properly. For the time being, this will fix the issue

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • Checked copying a form
  • Checked import/export of a form
  • Config checks in the configuration overview admin page
  • Problem detection in the admin email digest is handled

• Release management

  • I have labelled the PR as "needs-backport" accordingly

• I have updated the translations assets (you do NOT need to provide translations)

  • Ran ./bin/makemessages_js.sh
  • Ran ./bin/compilemessages_js.sh

• Dockerfile/scripts

  • Updated the Dockerfile with the necessary scripts from the ./bin folder

• Commit hygiene

  • Commit messages refer to the relevant Github issue
  • Commit messages explain the "why" of change, not the how

[robinmolen]

Silly idea, not needed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.59%. Comparing base (c07912d) to head (25761b7).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4928   +/-   ##
=======================================
  Coverage   96.59%   96.59%           
=======================================
  Files         758      758           
  Lines       25798    25798           
  Branches     3390     3390           
=======================================
  Hits        24919    24919           
  Misses        613      613           
  Partials      266      266           

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