bug(ios): FV keyboard's glitch prevents the use of the keyboard

**Describe the bug**

Original report by Anga Kuuksuakitiin at https://apps.apple.com/ca/app/firstvoices-keyboards/id1066651145.

Quote:

> Such an amazing app, but
> The keyboard sometimes glitches on occasions when I want to switch over to it and I can’t type with it. When it decides to stop working, it will only show the large grey box where the keys are supposed to be. It’s just a glitch, but it does slightly irritate me, hehe. I love this app, as it is literally the best and only app for endangered language keyboards, pls pls fix this lil glitch if you get the chance. It makes my life working with Plains Y Cree a lot easier.

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**Keyman for iPhone/iPad:**
- Device: ?
- OS: ?
- Keyman version: ?
- Target application: ?