remove usb_trans_info from dissect_usb_interface_descriptor()

Change-Id: Ia1bfdd705021e784213e00b70cfabc42b524384d
Reviewed-on: https://code.wireshark.org/review/3781
Reviewed-by: Martin Kaiser <wireshark@kaiser.cx>
Tested-by: Martin Kaiser <wireshark@kaiser.cx>