When building the directions API call we add trailing zeros to digits

This request
```
directions/v5/mapbox/driving/13.430100,52.510900;13.426500,52.508000;13.431600,52.502100?access_token=pk.XXX&geometries=polyline&bearings=60.000000,45.000000;;45.000000,45.000000
```
shows that we are forcing 6 digits and causing trailing zeros.

cc: @zugaldia 