Updated more call sites to use default background color

Issue: #5660

Author: buchen

name.abuchen.portfolio.ui/src/name/abuchen/portfolio/ui/views/PerformanceChartView.java

@@ -21,7 +21,6 @@
 import org.eclipse.jface.layout.GridLayoutFactory;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.widgets.Composite;
-import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.swtchart.ISeries;
 
@@ -35,6 +34,7 @@
 import name.abuchen.portfolio.ui.PortfolioPlugin;
 import name.abuchen.portfolio.ui.UIConstants;
 import name.abuchen.portfolio.ui.util.AbstractCSVExporter;
+import name.abuchen.portfolio.ui.util.Colors;
 import name.abuchen.portfolio.ui.util.DropDown;
 import name.abuchen.portfolio.ui.util.SimpleAction;
 import name.abuchen.portfolio.ui.util.chart.TimelineChart;
@@ -110,7 +110,7 @@ protected void addButtons(ToolBarManager toolBar)
     protected Composite createBody(Composite parent)
     {
         Composite composite = new Composite(parent, SWT.NONE);
-        composite.setBackground(Display.getDefault().getSystemColor(SWT.COLOR_WHITE));
+        composite.setBackground(Colors.theme().defaultBackground());
 
         chart = new TimelineChart(composite);
         chart.getTitle().setText(getTitle());

name.abuchen.portfolio.ui/src/name/abuchen/portfolio/ui/views/ReturnsVolatilityChartView.java

@@ -36,6 +36,7 @@
 import name.abuchen.portfolio.ui.Images;
 import name.abuchen.portfolio.ui.Messages;
 import name.abuchen.portfolio.ui.util.AbstractCSVExporter;
+import name.abuchen.portfolio.ui.util.Colors;
 import name.abuchen.portfolio.ui.util.DropDown;
 import name.abuchen.portfolio.ui.util.LabelOnly;
 import name.abuchen.portfolio.ui.util.SimpleAction;
@@ -200,7 +201,7 @@ protected Composite createBody(Composite parent)
         cache = make(DataSeriesCache.class);
 
         Composite composite = new Composite(parent, SWT.NONE);
-        composite.setBackground(Display.getDefault().getSystemColor(SWT.COLOR_WHITE));
+        composite.setBackground(Colors.theme().defaultBackground());
 
         resources = new LocalResourceManager(JFaceResources.getResources(), composite);