Google Calendar block: Fix error message positioning

[apeatling]

When providing an invalid embed link fix the error message positioning.
Fixes #14824

Before:

After:

Testing instructions:

• Insert a Google Calendar block and provide an invalid embed link
• Check the error message is aligned as per the screenshot above.

Proposed changelog entry for your changes:

None

[matticbot]

Caution: This PR has changes that must be merged to WordPress.com
Hello apeatling! These changes need to be synced to WordPress.com - If you 're an a11n, please commandeer, review, and approve D39546-code before merging this PR. Thank you!

[jetpackbot]

Thank you for the great PR description!

When this PR is ready for review, please apply the [Status] Needs Review label. If you are an a11n, please have someone from your team review the code if possible. The Jetpack team will also review this PR and merge it to be included in the next Jetpack release.

Scheduled Jetpack release: March 3, 2020.
Scheduled code freeze: February 25, 2020

Generated by 🚫 dangerJS against b557680

[mdbitz]

@apeatling Hi Andy, I was reviewing this and confirmed the margin is added to the notice. However I'm showing that all the content is centered. Seeing this on both twentysixteen & twentytwenty and wanted to confirm there wasn't anything to be concerned about.

[apeatling]

@mdbitz I'm not seeing the centering with twentytwenty, but I do see some odd font usage. I'll dig in a bit and see what's up. I don't think it's related to my change.

[mdbitz]

:nod: I see the centering when I use master as well. I'm going to approve this and bring it across into 8.3 as its unrelated.

[mdbitz]

Verified margin is applied to the notice.

[mdbitz]

Cherry Picked in : 7e42673

[pablinos]

r203589-wpcom