Shipping the translation on raw_port was too wide. That flag means 'the picture
comes from the board, not the driver', which is true in DAW mode AND in custom
mode -- but only DAW mode has a fixed, known numbering we may rewrite. Custom
mode speaks whatever the user assigned, so translating it would have been a
second wrong picture with the opposite sign.

Not hypothetical: midiviz's reader was on 24:0 'LCXL3 1 MIDI In' at the moment
this was written (its aseqdump child, PPID 7049), i.e. exactly the port the
wide rule would have mistranslated.

So two flags for two questions. raw_port keeps the warning pip on any raw LCXL3
read; v3_dialect authorises the rewrite and only DAW satisfies it.