Ania.update modal example

[aniaskrzydlo]

Short description (with a reference to an issue).

Issue: #377

I think we have some mess in the functions to remove modals - removeModal() actually hides all modals, the same as remove_all_modals, while remove_modal tries to use shiny::removeUI. I will ask on Slack if and how we want to clean this up.

For now I just updated the example to hide the modal and it should work fine.

DoD

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[federiva]

LGTM!
Thanks!

[federiva]

@aniaskrzydlo I have set the CI to run the tests again, feel free to merge and delete once the tests pass. 👍