fix controls layout in landscape

[RobozinhoD]

the warning wasn't well positioned

Purpose / Description

Describe the problem or feature and motivation

Fixes

• Fixes [BUG]: The layout of the Gesture Picker screen is not rendering properly when viewed in landscape mode. #17158

Approach

Position the warning correctly. The picker can get smaller if there is a warning. The only way that I see to fix that is to put the spinner aligned with the buttons or make the picker smaller, but I wanted to just fix the issue for now.

How Has This Been Tested?

a.webm

Checklist

Please, go through these checks before submitting the PR.

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[mikehardy]

LGTM, thanks