iOS: Fixes #11544: Fix blank screen on bringing app from background

[personalizedrefrigerator]

Summary

This pull request may fix #11544 by applying a version of a workaround for the upstream WebView issue.

The workaround reloads the WebView when its renderer/content process terminates.

Note

I've only observed the issue on iOS, but the workaround linked to the upstream issue applies to both iOS and Android.

Testing

iOS 18.2:

1. Start Joplin.
2. Open the note editor.
3. Verify that the note editor loads.
4. Switch to another app (Safari).
5. Wait 5-10 seconds.
6. Switch back to Joplin.
7. Verify that the note is still visible.

Android:

1. Start Joplin.
2. Open the note editor.
3. Verify that the note editor loads.
4. Switch to a different app.
5. Switch back to Joplin.
6. Verify that the note editor is still visible.

Note

I experience #11544 regularly on a particular iOS device. However, I'm testing on a different device on which I have not been able to reproduce the issue.