Revert "part deletion handling"

This reverts commit 6ab2002021ac1df26ebe77f488f5cd94e1df0b26.

src/App/Origin.cpp

@@ -45,10 +45,7 @@ PROPERTY_SOURCE(App::Origin, App::GeoFeatureGroup)
 
 Origin::Origin(void)
 {
-    //placement can't be changed
     Placement.StatusBits.set(3, true);
-    //origin can not be deleted by user
-    StatusBits.set(ObjectStatus::Undeletable, true);    
 }
 
 Origin::~Origin(void)