chore(radio): actually use the defined USB joystick strings

[ThomasKuehne]

USBD_HID_CONFIGURATION_FS_STRING and USBD_HID_INTERFACE_FS_STRING are defined but never used because the string IDs in the joystick descriptor are 0.

output from lsusb -d 1209:4f54 -v before:

iConfiguration 0 iInterface 0

output from lsusb -d 1209:4f54 -v after:

iConfiguration 4 HID Config iInterface 5 HID Interface