Fix udev vid/pid capitalization.

[kitlith]

These are case-sensitive strings, not hexadecimal literals, unfortunately.

This caused rules for all devices aside from FTDI and smol slimes to never trigger.

[kitlith]

An aside, because people might find how I diagnosed this to be useful information.

the way I diagnosed this was by using (iirc) udevadm test /dev/ttyUSB0, noticing that the rules weren't getting applied, and then checking udevadm test -v /dev/ttyUSB0, which also lists the various ways that cause rules to not be applied.

This led to finding a line that boiled down to "1A86" not being equal to "1a86".