Fix delete of pwm_fan_control.py command from .bashrc in install_service.sh

[lubomben]

install_service.sh should be executed with sudo otherwise it fails.

In addition, if executed with sudo the variable $HOME will be evaluated with "/root" so the line with "pwm_fan_control.py" will not be found in .bashrc so we should use another variable evaluated tu the user's home that execute sudo:

USER_HOME=$(getent passwd $SUDO_USER | cut -d: -f6)
sed -i '/pwm_fan_control.py/d' $USER_HOME/.bashrc