Refs #17087

As titled, this PR fixes the issue where sometimes the cell separator is still displaying the margins for the landscape orientation (around 67pt from the view edge) when the screen is already displayed in portrait (where it should be around 20pt). Here's a screenshot:

•	Before	After
Content alignment, portrait.1
Content alignment, landscape.2
Content alignment (with Delete) button, portrait.3
Content alignment (with Delete) button, landscape.4

To Test

• Enable newCommentDetail feature flag.
• Navigate to My Site > Comments, and select any approved comments.
• 🔎 Verify that the cells' contents are neatly aligned.¹
• Rotate the device/simulator to landscape.
• 🔎 Verify that the cell separators are aligned correctly.
• Rotate the device/simulator back to portrait.
• 🔎 Again, verify that the cell separators are aligned correctly.
• Go back to My Site > Comments, and select any spam or trashed comments. Repeat the verification steps above.
• 🔎 Also verify that while in portrait or landscape, the cells before the Delete button does not show a separator line.

Regression Notes

1. Potential unintended areas of impact
   n/a. Feature is not released yet.

2. What I did to test those areas of impact (or what existing automated tests I relied on)
   Manually tested to ensure that it behaves correctly.

3. What automated tests I added (or what prevented me from doing so)

4. n/a. Feature is not released yet.

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.