Correct the Microsoft OS string that indicates this device supports extended feature descriptors

FYI Last byte of this structure must be 0x01

struct microsoft_os_descriptor os_descriptor =
				{
					0x12,                          /* bLength */
					0x3,                           /* bDescriptorType */
					{'M','S','F','T','1','0','0'}, /* qwSignature */
					MICROSOFT_OS_DESC_VENDOR_CODE, /* bMS_VendorCode */
					0x01,                          /* bPad Must be 0x01 */
				};