WaypointNavigationActivity example activity stops after first waypoint

[neonef]

Android API: 28
Mapbox Navigation SDK version: 7.1.0
Mapbox Navigation UI 0.28.0

Steps to trigger behavior

1. Copy WaypointNavigationActivity example activity into my app without changes.
2. Run

Actual behavior

After first waypoint, the simulated car stops.

[danesfeder]

@neonef nice catch, fix moving in #1724