Fix crash in UserProfileSheetViewController

[kean]

Fixes #21084 (https://a8c.sentry.io/issues/3804144050/?environment=appStore&project=5716771&query=release%3Acom.automattic.jetpack%4025.4.2%2B25.4.2.0&referrer=release-issue-stream). It is a pretty common crash. I hope it only affects this screen, and it does seem to be the case based on the callstacks.

To test:

Regression Notes

1. Potential unintended areas of impact

2. What I did to test those areas of impact (or what existing automated tests I relied on)

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

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.

Testing checklist:

• WordPress.com sites and self-hosted Jetpack sites.
• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• VoiceOver.
• Languages with large words or with letters/accents not frequently used in English.
• Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• iPhone and iPad.
• Multi-tasking: Split view and Slide over. (iPad)

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 25.5. The due date for this milestone has already passed. Please assign it to a milestone with a later deadline or check whether the release for this milestone has already been finished.

Generated by 🚫 Danger

[kean]

Getting rid of one more incorrect use of WPDeviceIdentification.isiPad() 🥳

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress Alpha by scanning the QR code below to install the corresponding build.

	App Name	WordPress Alpha
	Configuration	Release-Alpha
	Build Number	pr23833-48a31aa
	Version	25.4.2
	Bundle ID	org.wordpress.alpha
	Commit	48a31aa
	App Center Build	WPiOS - One-Offs #11081

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[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack Alpha by scanning the QR code below to install the corresponding build.

	App Name	Jetpack Alpha
	Configuration	Release-Alpha
	Build Number	pr23833-48a31aa
	Version	25.4.2
	Bundle ID	com.jetpack.alpha
	Commit	48a31aa
	App Center Build	jetpack-installable-builds #10122

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.