Migrate RuntimeStyleActivity off Mapzen tiles

[1ec5]

The Android testapp’s RuntimeStyleActivity.addCustomTileSource() makes use of Mapzen’s vector tile service, which will go away soon:

mapbox-gl-native/platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/style/RuntimeStyleActivity.java

Line 467 in 228aadc

Source source = new VectorSource("custom-tile-source", new TileSet("2.1.0", "https://vector.mapzen.com/osm/all/{z}/{x}/{y}.mvt?api_key=vector-tiles-LM25tq4"));

We should replace this usage with Mapillary vector tiles, as seen in the Android demo app:

https://github.com/mapbox/mapbox-android-demo/blob/b17591ca120be81be3e26ce0652e9ced7e09f0a9/MapboxAndroidDemo/src/main/java/com/mapbox/mapboxandroiddemo/labs/SymbolLayerMapillaryActivity.java#L1098

Hat tip to @tobrun for the suggestion.