chart2: fix duplicate entries at index 0

... introduced at 6949629e.

Change-Id: Ifc5c2f92584aabe668eb8c87abdc5085d4a7b075
Reviewed-on: https://gerrit.libreoffice.org/17377Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

chart2/source/model/main/DataPoint.cxx

@@ -284,12 +284,12 @@ void DataPoint::fireModifyEvent()
 
 Sequence< OUString > DataPoint::getSupportedServiceNames_Static()
 {
-    Sequence< OUString > aServices( 4 );
-    aServices[ 0 ] = "com.sun.star.drawing.FillProperties";
-    aServices[ 0 ] = "com.sun.star.chart2.DataPoint";
-    aServices[ 1 ] = "com.sun.star.chart2.DataPointProperties";
-    aServices[ 2 ] = "com.sun.star.beans.PropertySet";
-    return aServices;
+    return Sequence< OUString >{
+        "com.sun.star.drawing.FillProperties",
+        "com.sun.star.chart2.DataPoint",
+        "com.sun.star.chart2.DataPointProperties",
+        "com.sun.star.beans.PropertySet"
+    };
 }
 
 // needed by MSC compiler