Fix compilation of CInterfaceFTDI if MRPT_HAD_FTDI is false
Fix compilation of CInterfaceFTDI if MRPT_HAD_FTDI is false

As MRPT_TRY_END is outside the MRPT_HAS_FTDI block, the
MRPT_TRY_START macro should be outside as well.

MRPT/mrpt,MRPT/mrpt,MRPT/mrpt,MRPT/mrpt,MRPT/mrpt