input doesn't handle NUM_LOCK properly on Windows

[strager]

Describe the bug

Text is "" if numlock is enabled on the keyboard.

Culprit:

x/input/driver_windows.go

Lines 468 to 471 in 19b66ab

	if cks == 0 ||
	cks == xwindows.SHIFT_PRESSED ||
	cks == xwindows.CAPSLOCK_ON ||
	altGr {

cks is 0x20 (I think) when numlock is pressed.

Setup

• Windows 10
• Windows Terminal

To Reproduce

I tested with github.com/stt/opencode. I can't type into the prompt box unless I turn off numlock on my keyboard.

Source Code

I don't have a minimal repro, sorry.

Expected behavior

numlock should not affect the input of normal characters (a-z keys).