Select board type from command line doesn't work

[DawidRosinski]

Python script crashes when select board type different that default value. Changing action from append to store for -board argument should fix this issue.

pi@raspberrypi:~/pico/my-apps $ python ../../pico-project-generator/pico_project.py freertos-demo -d 0 -p vscode --overwrite -board pico_w
Traceback (most recent call last):
  File "/home/pi/pico/my-apps/../../pico-project-generator/pico_project.py", line 1369, in <module>
    args = ParseCommandLine()
  File "/home/pi/pico/my-apps/../../pico-project-generator/pico_project.py", line 915, in ParseCommandLine
    return parser.parse_args()
  File "/usr/lib/python3.9/argparse.py", line 1830, in parse_args
    args, argv = self.parse_known_args(args, namespace)
  File "/usr/lib/python3.9/argparse.py", line 1863, in parse_known_args
    namespace, args = self._parse_known_args(args, namespace)
  File "/usr/lib/python3.9/argparse.py", line 2072, in _parse_known_args
    start_index = consume_optional(start_index)
  File "/usr/lib/python3.9/argparse.py", line 2012, in consume_optional
    take_action(action, args, option_string)
  File "/usr/lib/python3.9/argparse.py", line 1940, in take_action
    action(self, namespace, argument_values, option_string)
  File "/usr/lib/python3.9/argparse.py", line 1035, in __call__
    items.append(values)
AttributeError: 'str' object has no attribute 'append'

[JamesH65]

Hmm, not sure how I missed that one in testing! Thanks for the report and the fix.