digitizer: set physical size

[windo]

Fix digitizer cursor movements on platforms that require a physical maximum value.

Description

At least on linux with X11, without a physical size set the cursor does not move. Setting the maximum phyiscal value to anything non-zero seems to work equally well, so setting it to 1024 which I think should imply a ~10 inch physical touchpad size.

I assume this works as-is on other OSs, so it would probably be wise to try to test this to make sure it does not cause a regression on some other platform. I've tested on a an Ubuntu laptop with X11 (broken before change, fixed after the change) and on a Windows laptop and a Chromebook (both working both before and after the change). I don't have an Apple laptop to test on.

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout (addition or update)
• Documentation

Issues Fixed or Closed by This PR

I haven't filed an issue, but happy to add one if you think one is needed.

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[windo]

@a-chol @fauxpark - as people who might have some expertise, does this look reasonable to you?