Reset Special-Character Mode of Keyboard when active editable element loses focus

[cvan]

Hardware

Oculus Go
30f6d4e

Steps to Reproduce

1. Load https://webxr.sh/editable
2. Type these characters in one of the text fields: abc123
3. Press a different text field and type the same: abc123
4. Notice you have to manually press the ABC on the keyboard to reset the layout from numeric to alphabetic.

Current Behavior

If in the numeric or special-characters mode, you have to manually press the ABC on the keyboard to reset the layout back to the default (ABC).

Expected Behavior

When the user moves to a new editable field (either by a deliberate user action or if the browser/webpage changes focus) — that is, when document.activeElement changes — the keyboard layout should revert to the default layout (ABC).