Add missing props in stories

[aamct2]

What I did

• A couple of the stories were throwing errors in the console when running the Official Storybook example as they were missing some required props. I've added them in.

How to test

• Run the Official Storybook example and open the console. You should see no more missing prop errors.

[codecov]

Codecov Report

Merging #6353 into next will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             next    #6353   +/-   ##
=======================================
  Coverage   40.81%   40.81%           
=======================================
  Files         616      616           
  Lines        8519     8519           
  Branches      535      535           
=======================================
  Hits         3477     3477           
  Misses       4950     4950           
  Partials       92       92

Impacted Files	Coverage Δ
lib/ui/src/components/preview/iframe.stories.js	100% <100%> (ø)	⬆️

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[shilman]

LGTM! Thanks!

[Armanio]

Hi @aamct2! Could you resolve conflicts? I think we can merge it after resolving all problems. 👍

[vercel]

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[shilman]

LGTM! Thanks