samplebase.py does not accept '--led-gpio-mapping=regular-pi1'

[beta-tester]

hi,

i just dug up my old Raspberry Pi 1B rev.1 and let it drive my also old led-matrix panels.
first i stubled around with the RPi 1B rev1 related issue of the missing green color at the top half of the matrix.

after i found the solution to that issue by using --led-gpio-mapping=regular-pi1, i now observed another issue.

rpi-rgb-led-matrix/bindings/python/samples/samplebase.py does not accept that option.

error: argument -m/--led-gpio-mapping: invalid choice: 'regular-pi1' (choose from 'regular', 'adafruit-hat', 'adafruit-hat-pwm')

i can add that option to the list of accepted choices in samplebase.py but i guess that there are other options/choices missing for other parameters. maybe this file is not up to date.

[hzeller]

Yes, I think old Pi's are so rare and using Python on a Pi1 is very slow to use that nobody encountered this omission yet.
Please send a pull request with that choice added.