Fix permission config.txt 
Fix permission config.txt 

losing write access when switch user.
I see its get 600!
silvanmelchior/RPi_Cam_Web_Interface,konstantinj/RPi_Cam_Web_Interface,silvanmelchior/RPi_Cam_Web_Interface,konstantinj/RPi_Cam_Web_Interface,silvanmelchior/RPi_Cam_Web_Interface,silvanmelchior/RPi_Cam_Web_Interface,konstantinj/RPi_Cam_Web_Interface,konstantinj/RPi_Cam_Web_Interface,silvanmelchior/RPi_Cam_Web_Interface