Add pin mode definition to fix Button class on Pico 2

Author: isaac-webb

micropython/modules_py/pimoroni.py

@@ -96,7 +96,7 @@ def __init__(self, button, invert=True, repeat_time=200, hold_time=1000):
         self.invert = invert
         self.repeat_time = repeat_time
         self.hold_time = hold_time
-        self.pin = Pin(button, pull=Pin.PULL_UP if invert else Pin.PULL_DOWN)
+        self.pin = Pin(button, Pin.IN, Pin.PULL_UP if invert else Pin.PULL_DOWN)
         self.last_state = False
         self.pressed = False
         self.pressed_time = 0