don't inherit the style from the title, related bnc#880488

It seems that inheriting the style from the title for the subtitle is
just wrong.

Change-Id: Icbedf3e934b13514e50a1354552e5d6a8d139095

oox/source/ppt/pptshape.cxx

@@ -149,7 +149,6 @@ void PPTShape::addShape(
                             sServiceName = OUString();
                         else {
                             sServiceName = "com.sun.star.presentation.SubtitleShape";
-                            aMasterTextListStyle = rSlidePersist.getMasterPersist().get() ? rSlidePersist.getMasterPersist()->getTitleTextStyle() : rSlidePersist.getTitleTextStyle();
                         }
                     }
                     break;