Ensure defaults are passed along for multiselect arrays when minItems…

[fsteger]

… present (#1258)

Reasons for making this change

When minItems is present for multi select array fields, the default value returned was always an empty array.

Addresses issue #1258

Checklist

• I'm updating documentation
  • I've checked the rendering of the Markdown text I've added
• I'm adding or updating code
  • I've added and/or updated tests
  • I've updated docs if needed
  • I've run npm run cs-format on my branch to conform my code to prettier coding style
• I'm adding a new feature
  • I've updated the playground with an example use of the feature

[epicfaace]

@fsteger thanks for the PR -- can you add a test for the case in which default is an array of items (such as the example in issue #1258)? It looks like the test you added is a duplicate of an existing test.

[epicfaace]

Thanks!