LogIndex DistanceTraveled heading wrong (Dataflash only)

#### Issue details
When reading from BIN files, the Distance Heading column shows m, but the actual values are mm - I think just divide by 1 000 000 to correct, it will also fix the issue where it is formatted in scientific notation over 50km (50 000 000 mm).

#### Version
1.3.68

#### Platform
[ ] All
[ ] AntennaTracker
[X] Copter
[X] Plane
[ ] Rover
[ ] Sub

#### Airframe type
Fixed wing

#### Hardware type
_What autopilot hardware was used? (pixhawk, pixracer, PX4FMU etc)_
Pixhawk

#### Logs
Any DATAFLASH log will show this issue (TLOG seems fine)

Start by reproducing the issue with a DATAFLASH BIN log and inspect the LogIndex Distance Heading handling; the payload does not name a source file or test. Done means BIN values are shown with the correct meter conversion without scientific notation at distances over 50 km, while TLOG behavior remains unchanged.

Written by the indexing model from the issue text.