Fix IllegalStateException in domain registration fragment

[nbradbury]

Fixes #21563 - Note that this targets 25.6

In trunk follow these steps to reproduce the crash:

• From the My Site tab, tap to change sites
• Choose Add a site
• Choose Create WordPress.com site
• Skip choosing a topic or theme
• When you get to Choose a domain, search for a domain ("Test" works fine)
• Scroll down then tap the Search button on the soft keyboard
• Boom!

Then pull this branch, follow the same steps, and notice no Boom!

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 25.6 ❄️. 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

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[wpmobilebot]

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

	App Name	Jetpack
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr21566-0d9fafa
	Commit	0d9fafa
	Direct Download	jetpack-prototype-build-pr21566-0d9fafa.apk

Note: Google Login is not supported on these builds.

[wpmobilebot]

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

	App Name	WordPress
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr21566-0d9fafa
	Commit	0d9fafa
	Direct Download	wordpress-prototype-build-pr21566-0d9fafa.apk

Note: Google Login is not supported on these builds.

[tiagomar]

This change seems to fix the crash. I wasn't able to reproduce it in this build.

I concentrated my testing around Focus and covered the following scenarios:

• Screen rotation
• Split screen
• Sending the app to background
• Locking the screen
• Tapping other elements
• Navigating to "Help" and "Choose a theme" screens
• Different text input types like autocomplete, talk-to-text and handwriting
• Tablet + external keyboard

I also checked the other domains search entry points just in case (they're all quite different) and couldn't reproduce even with the 25.5.

Devices:

• Pixel 8 Pro (Android 14)
• Samsung Galaxy Tab S9 Ultra (Android 14)
• Samsung Galaxy Note 20 (Android 12)