Add Ergo m575 to the list of tested devices

[vitek]

Here is my configuration:

{
    name = "ERGO M575 Trackball";
    buttons =
    (
        // thumb front
        {
            cid: 0x53;
            action = {
                type: "Keypress";
                keys: ["KEY_LEFTMETA", "KEY_LEFT"];
            };
        },
        // thumb back
        {
            cid: 0x56;
            action = {
                type: "Keypress";
                keys: ["KEY_LEFTMETA", "KEY_RIGHT"];
            };
        };
}
)