bug(iOS): Keyboard disappeared on iPad after changing device orientation to Landscape mode

**Description**
Keyman Keyboard disappeared on iPad Air Simulator after changing the device position into Landscape.

**To Reproduce**

1. Open iPad Air 5th generation Simulator.
2. Install Keyman 15.0.521-beta build.
3. Open Keyman In-App. Here, we may notice that the OSK appears correctly.
4. Press Command+R button to change the device orientation from Portrait to Landscape.
5. I noticed that the On Screen Keyboard is gone after changing the orientation.

**Expected behavior**
On Screen Keyboard should be consistent and appear after changing to landscape mode.

**Screenshots**
..in Portrait Mode:

..in Landscape Mode:

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**Keyman for iPhone/iPad/Android:**
- Device: iPad Air 5th generation
- OS: iOS 15.5
- Keyman version : Keyman 15.0.521-beta
- Target application: Keyman

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**Keyboard**
- Keyboard name: EuroLatin (SIL)
- Keyboard version: 1.9.6
- Language name: English

**Additional context**
I was not able to reproduce this issue in iPhone 13 Pro Simulator.