mapbox: bugfix show features

src/maps/Mapbox.js

@@ -94,13 +94,17 @@ export default class Mapbox extends React.Component{
           </Marker>
       )}
     } else {
-      markers = this.state.path.map((pos, idx) =>
-        <Feature
-          coordinates={pos}
-          key={idx}
-          draggable={true}
-          onDragEnd={(e) => this.updateMarker(idx, e)}
-        />
+      markers = (
+        <Layer type="symbol" id="marker" layout={{"icon-image": "marker-15"}}>
+          {this.state.path.map((pos, idx) =>
+            <Feature
+              coordinates={pos}
+              key={idx}
+              draggable={true}
+              onDragEnd={(e) => this.updateMarker(idx, e)}
+            />
+          )}
+        </Layer>
       )
     }