Update xpad.c to make leds work on Wireless Xbox gamepads.

Removed the old code which wasn't working properly; added some new code to make it work.
Added a message upon wireless gamepad connection, I think it is a good thing, but I need some comments on this.
Also corrected a typo line 143, with Mad Catz JOYTECH NEO SE Advanced GamePad : added 0 before controller type.