fix(slides): update swiper instance after initialization

[sean-perkins]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

When having a swiper instance (ion-slides) in a modal, subsequent initializations of the component will fail to initialize swiper; resulting in a developer to manually call .update() at an unspecified time.

Github repo of issue: https://github.com/dtarnawsky/cs-ion-slides-bug

Issue Number: N/A

What is the new behavior?

Forces the swiper instance to update 20ms after the initialization callback. This causes event bindings and instantiation logic to correctly apply when having ion-slides in a modal.

Does this introduce a breaking change?

• Yes
• No

Other information

Reverts #20899.

The original repo for that PR/issue is unavailable, attempted to create a new repo here: https://github.com/sean-perkins/ion-slides-issue.

I could see it making sense to leave the patch fix in this PR and later revert that commit after v6. Open to feedback 👍

[liamdebeasi]

Can you make sure this does not regress #20356? Whoops didn't see the bottom of your post. 👍