show the correct color in the custom color picker in chart sidebar

Change-Id: I14b4f354ec48997f4656b82de14e87a684f1f752

svx/source/tbxctrls/tbcontrl.cxx

@@ -2706,6 +2706,7 @@ void SvxColorToolBoxControl::StateChanged(
                 aColor = static_cast< const XFillColorItem* >(pState)->GetColorValue();
         }
         m_xBtnUpdater->Update( aColor );
+        mPaletteManager.SetLastColor(aColor);
     }
 }