Fix order of parameters in call to _addTimeDistance when using a RTL waypoint

[AsensioL]

Fix order of parameters in call to _addTimeDistance when using a RTH waypoint

Description

This corrects the order of parameters when calling MissionController::_addTimeDistance
Note that the last 3 parameters are time, distance and sequenceNumber (in that order), and they are used correctly everywhere except where corrected by this PR, where previously they had been ordered distance, time and sequenceNumber (note time and distance were swapped).

This escaped the compiler because both parameters are double.

As a result:

• Before, when creating a route that included a Return To Launch waypoint the "Total Mission" "Distance" shown on top was -.-.
  • For some reason this does not happen when downloading the route from the Drone to QGC.
• After the fix, when creating a route that includes a Return To Launch/Home waypoint the "Total Mission" "Distance" shown is the correct value.

Test Steps

Create a new Plan from scratch in the Plan View:

1. IMPORTANT: Manually add Take Off point
2. Add 2 or 3 waypoints
3. Add a Return to Launch waypoint
4. Observe the "Total Mission" Distance on the top toolstrip

Checklist:

• Review Contribution Guidelines.
• Review Code of Conduct.
• I have tested my changes.

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