Remove client config files when uninstalling

Add "uninstall generated client file" to the `uninstallWg()` function. Something like this, but removing all custom WG config files:

```
function uninstallWg(){
#REMOVE USER CONFIG
# Home directory of the user, where the client configuration will be written
CLIENT_NAME=$(grep -E "^### Client" "/etc/wireguard/${SERVER_WG_NIC}.conf" | cut$
if [ -e "/home/${CLIENT_NAME}" ]; then # if $1 is a user name
HOME_DIR="/home/${CLIENT_NAME}"
elif [ "${SUDO_USER}" ]; then # if not, use SUDO_USER
HOME_DIR="/home/${SUDO_USER}"
else # if not SUDO_USER, use /root
HOME_DIR="/root"
fi
echo "usr config delete: ${HOME_DIR}/${SERVER_WG_NIC}-client-${CLIENT_NAME}.conf"
# remove generated client file
rm -f "${HOME_DIR}/${SERVER_WG_NIC}"-client-*.conf

rm -rf /etc/wireguard
rm -f /etc/sysctl.d/wg.conf
}
```

P.S. If you do not delete the custom WG configuration files and remove the protective cover, then when you reinstall it, configurations 2, 3, 4, 5 ... for one user will appear in the custom file, and the QR code will become larger and displayed with errors