Reducing code duplication in `dancepad.py`

[Saphereye]

Can be probably rewritten to

import serial
import pyautogui

arduino = serial.Serial(port='COM15', baudrate=9600)
val=arduino.read().decode().strip()

while (True):
  val = arduino.read().decode().strip()

  if val.isupper(): # New part
    pyautogui.keyDown(val.lower())
  else:
    pyautogui.keyUp(val)

Now can be generalised to all keys

[lazybug19]

ok sir