Moved some methods from PartDesign::Body to Part::BodyBase so the SketchObjects will be removed cleanly from the Body when deleted

src/Mod/Sketcher/Gui/ViewProviderSketch.cpp

@@ -4875,5 +4875,5 @@ bool ViewProviderSketch::onDelete(const std::vector<std::string> &subList)
         return false;
     }
     // if not in edit delete the whole object
-    return true;
+    return PartGui::ViewProviderPart::onDelete(subList);
 }