Clear lastHighlighted when clear is called

Author: danielgindi

MPChartLib/src/main/java/com/github/mikephil/charting/charts/Chart.java

@@ -315,6 +315,7 @@ public void clear() {
         mData = null;
         mOffsetsCalculated = false;
         mIndicesToHighlight = null;
+        mChartTouchListener.setLastHighlighted(null);
         invalidate();
     }