reduce further the number of tracked variables necessary for defaults

Author: grobolom

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

@@ -125,9 +125,7 @@ public class ChartView extends View {
     private boolean chartByDistance = false;
     private UnitSystem unitSystem = UnitSystem.defaultUnitSystem();
     private boolean reportSpeed = true;
-    private boolean showElevation = true;
     private boolean showPaceOrSpeed = true;
-    private boolean showHeartRate = true;
     private boolean showPointer = false;
 
     private final GestureDetectorCompat detectorScrollFlingTab = new GestureDetectorCompat(getContext(), new GestureDetector.SimpleOnGestureListener() {
@@ -362,8 +360,8 @@ protected boolean drawIfChartPointHasNoData() {
         }
 
         // Defaults for our chart series.
-        heartRateSeries.setEnabled(showHeartRate);
-        elevationSeries.setEnabled(showElevation);
+        heartRateSeries.setEnabled(true);
+        elevationSeries.setEnabled(true);
     }
 
     @Override
@@ -421,7 +419,6 @@ public boolean applyReportSpeed() {
     }
 
     void setShowElevation(boolean value) {
-        showElevation = value;
         elevationSeries.setEnabled(value);
     }
     void setShowPaceOrSpeed(boolean value) {