Change gnome terminals defualt theme in keyfile

Change gnome terminal to white text on black background theme like other linux distributions terminals and Windows do.

This change will set the terminal to look like most do and ignore whatever Gnome chooses the default to be. This is what the default terminal looks like on Microsoft Windows (Powershell) and on other linux distributions and desktop environments like XFCE and KDE look like. The terminal currently looks like text editor more then a terminal and i'm sure both new and advanced users would appreciate this change in the look.