Remove a couple of duplicated localization keys

[mokagio]

I noticed these while testing the changes from #20009. Or rather, bundle exec fastlane generate_strings_file_for_glotpress noticed these:

[16:01:52]: -------------------------------------------------
[16:01:52]: --- Step: ios_generate_strings_file_from_code ---
[16:01:52]: -------------------------------------------------
[16:01:54]: ▸ Key "jetpack.fullscreen.overlay.newUsers.stats.subtitle" used with multiple values. Value "Watch your traffic grow with helpful insights and comprehensive stats." kept. Value "Find and follow your favorite sites and communities, and share you content." ignored.
[16:01:54]: ▸ Key "jetpack.fullscreen.overlay.newUsers.stats.subtitle" used with multiple values. Value "Watch your traffic grow with helpful insights and comprehensive stats." kept. Value "Get notifications for new comments, likes, views, and more." ignored.
[16:01:55]: ▸ Key "widget.today.nodata.view.title" used with multiple values. Value "Unable to load site stats." kept. Value "Unable to load today's stats." ignored.

Testing

Checkout this branch, run bundle exec fastlane generate_strings_file_for_glotpress skip_commit:true and verify it prints no warnings:

The diff will also show entries for the de-duplicated keys in Localizable.strings, but it will be tricky to spot them in between all the new strings. A way to verify this would be:

1. Checkout a new branch from trunk
2. Run bundle exec fastlane generate_strings_file_for_glotpress
3. Merge this PR in the new branch
4. Run bundle exec fastlane generate_strings_file_for_glotpress skip_commit:true again
5. This time, only the edited keys should show in the diff

However, our automation is tried and tested and I didn't feel the need to got to such length to verify it.

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.

---

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

[mokagio]

This is a typo fix, which I noticed by chance. We don't yet have tooling to spot this minor issues 😅

[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 pr20030-068c198 on your iPhone

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

[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 pr20030-068c198 on your iPhone

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

[staskus]

Thanks for the fixes 🙏. I ran the given tests and can verify the behavior.