Not working with Bluetooth touchpad

[vgmoose]

Steps to reproduce:

1. Downloaded the latest release
2. Gave permission in Gatekeeper, and input event monitoring in Security
3. No fingers are being tracked under "Show Preview"

OS: 10.15.3

I believe this worked in a previous version, and the way we fetch the touchpad should still work for BT:

GlassController/glass/main.swift

Lines 109 to 111 in 6d64807

	var dev = MTDeviceCreateDefault()
	MTRegisterContactFrameCallback(dev, processTouchpadData);
	MTDeviceStart(dev, 0);

There may be a missing step for permission granted that should be prompted by the app itself