use the correct default value, fdo#78080

Change-Id: I8b01bf22e8e3b98ef013b947f617905d558d3554

oox/source/drawingml/chart/chartspacefragment.cxx

@@ -85,8 +85,7 @@ ContextHandlerRef ChartSpaceFragment::onCreateContext( sal_Int32 nElement, const
             switch( nElement )
             {
                 case C_TOKEN( autoTitleDeleted ):
-                    // default is 'false', not 'true' as specified
-                    mrModel.mbAutoTitleDel = rAttribs.getBool( XML_val, false );
+                    mrModel.mbAutoTitleDel = rAttribs.getBool( XML_val, true );
                     return 0;
                 case C_TOKEN( backWall ):
                     return new WallFloorContext( *this, mrModel.mxBackWall.create() );

oox/source/drawingml/chart/chartspacemodel.cxx

@@ -28,7 +28,7 @@ namespace chart {
 ChartSpaceModel::ChartSpaceModel() :
     mnDispBlanksAs( XML_gap ),  // not zero as specified
     mnStyle( 2 ),
-    mbAutoTitleDel( false ),
+    mbAutoTitleDel( true ),
     mbPlotVisOnly( false ),
     mbShowLabelsOverMax( false ),
     mbPivotChart( false )