Cleanup: simplify stream by using List operations (desugar).

src/main/java/de/dennisguse/opentracks/chart/ChartView.java

@@ -897,7 +897,7 @@ public class ChartView extends View {
      */
     private void updateSeries() {
         synchronized (chartPoints) {
-            seriesList.stream().forEach(this::updateSerie);
+            seriesList.forEach(this::updateSerie);
         }
     }