Revert "[PartDesign] Add Material property to Body"

This reverts commit 4fcf8f199c.

There is no need to make this a static property because it can be added at runtime via Python or the GUI

src/Mod/Part/App/BodyBase.cpp

@@ -44,7 +44,6 @@ BodyBase::BodyBase()
     Tip.setScope(App::LinkScope::Child);
 
     ADD_PROPERTY(BaseFeature , (0) );
-    ADD_PROPERTY_TYPE(Material, (0), 0, App::Prop_None, "The Material for this Part");
 
     App::OriginGroupExtension::initExtension(this);
 }