Notifications: Fix detailed notification view not scrolling in landscape

[hassaanelgarem]

Fixes #18811

Description

Fixes an issue where the detailed notification view was not scrollable in landscape mode.

Testing Instructions

1. Complete a Next Steps tour and get a notification
2. Change phone to landscape mode
3. Open navigations tab
4. Click on the notification
5. Make sure that the view is scrollable

Regression Notes

1. Potential unintended areas of impact
   N/A
2. What I did to test those areas of impact (or what existing automated tests I relied on)
   N/A
3. What automated tests I added (or what prevented me from doing so)
   N/A

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[wpmobilebot]

You can test the changes in Jetpack from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr18823-8c8eba3 on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[wpmobilebot]

You can test the changes in WordPress from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr18823-8c8eba3 on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[leandroalonso]

[peril-wordpress-mobile]

	Warnings
⚠️	This PR is assigned to a milestone which is closing in less than 4 days Please, make sure to get it merged by then or assign it to a later expiring milestone

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