Prevent RouteLeg list access for current step creation

[danesfeder]

Description

Found while testing:

Fatal Exception: java.lang.IndexOutOfBoundsException: Index: 4, Size: 4
       at java.util.ArrayList.get(ArrayList.java:411)
       at com.mapbox.services.android.navigation.v5.routeprogress.RouteLegProgress$Builder.build(RouteLegProgress.java:255)
       at com.mapbox.services.android.navigation.v5.routeprogress.RouteProgress$Builder.build(RouteProgress.java:298)
       at com.mapbox.services.android.navigation.v5.navigation.NavigationRouteProcessor.buildRouteProgressFrom(NavigationRouteProcessor.java:112)
       at com.mapbox.services.android.navigation.v5.navigation.NavigationRouteProcessor.buildNewRouteProgress(NavigationRouteProcessor.java:49)
       at com.mapbox.services.android.navigation.v5.navigation.RouteProcessorRunnable.process(RouteProcessorRunnable.java:61)
       at com.mapbox.services.android.navigation.v5.navigation.RouteProcessorRunnable.run(RouteProcessorRunnable.java:46)
       at android.os.Handler.handleCallback(Handler.java:761)
       at android.os.Handler.dispatchMessage(Handler.java:98)
       at android.os.Looper.loop(Looper.java:156)
       at android.os.HandlerThread.run(HandlerThread.java:61)

Implementation

Pass current LegStep to RouteProgress builder directly.

Testing

Please describe the manual tests that you ran to verify your changes

• New and existing unit tests pass locally with my changes

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code