Beta 1.3.70 ParameterMetaData missing ArduRover node

#### Issue details
_HELP->Check for Beta Updates_ in MP 1.3.70 to build 1.3.7418.14618 results in the ArduRover node being removed from USER\Documents\Mission Planner\ParameterMetaData.xml file. MP then shows no Units, Options or Description data in the UI and Full Parameter List.

#### Version
1.3.7418.14618

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

#### Airframe type
N/A

#### Hardware type
Pixhawk

#### Logs
N/A

Start by inspecting USER\Documents\Mission Planner\ParameterMetaData.xml and the Mission Planner update path that produces it, then compare the missing ArduRover node with the other vehicle nodes. Reproduce the Beta 1.3.70 update and verify that the Rover entry restores Units, Options, and Description data in the UI and Full Parameter List.

Written by the indexing model from the issue text.