samba permission of usbFlash and SD card bug after reboot

[manuio]

To reproduce:

• Connect usbFlash / SD card, enable samba connection and see its content.
• Reboot the board (disconnect and connect alim).
• Enable new samba connection and try to open usbFlash / SD card directory.

The result is the message: "The folder "usbFlash“ / "sd” can’t be opened because you don’t have permission to see its contents".

I've noticed that removing generated init.py solve the problem until next connection.

I've also noticed the same behavior when usbFlash / SD card is disconnected, samba connection restarted and usbFlash / SD card connected anew.

[ks156]

Fixed with this PR : https://github.com/nodesign/weio/pull/164