altosui: Work around lack of actual USB product names on Windows

altosui: Work around lack of actual USB product names on Windows

Windows doesn't provide an API to get the USB product name for
attached devices, it only provides the name listed in the .inf file
for each vid/pid. This means that you get 'TeleMega', or 'TeleMega
can't isolate the list to the correct version.

With this fix, at least the '#2' is stripped off, and the matching
code restricts itself to showing only TeleMega files instead of all
filenames starting with 'tele'.

Signed-off-by: Keith Packard <keithp@keithp.com>