Adjust examples demo theme contribution to default theme changes

The default theme changed properties of the ToolBar that were not
overwritten by the theme contribution of the examples demos.

Change-Id: I55b6dd7304c615215ca037fc3970398a50cadf46
Signed-off-by: Tim Buschtöns <tbuschto@eclipsesource.com>
diff --git a/examples/org.eclipse.rap.examples/theme/theme.css b/examples/org.eclipse.rap.examples/theme/theme.css
index 487dce9..6325982 100644
--- a/examples/org.eclipse.rap.examples/theme/theme.css
+++ b/examples/org.eclipse.rap.examples/theme/theme.css
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2011, 2012 EclipseSource and others.
+ * Copyright (c) 2011, 2015 EclipseSource and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -48,6 +48,9 @@
 ToolBar.navigation {
   font: 14px Verdana, "Lucida Sans", Arial, Helvetica, sans-serif;
   background-color: #34332F;
+  background-image: none;
+  border-radius: 0px;
+  border: none;
 }
 
 ToolItem.navigation {