FIX: When rescaling an object, "Uniform scale" is checked again

Change-Id: I850c63abe77e45380f49cbd96cfd6e500252d89c
(cherry picked from commit a2bbbd7051427d54aefd28a9bd6fcf3269eb304c)

src/slic3r/GUI/Gizmos/GizmoObjectManipulation.cpp

@@ -213,11 +213,6 @@ void GizmoObjectManipulation::update_if_dirty()
         update(m_cache.rotation, m_cache.rotation_rounded,  m_new_rotation);
     }
 
-
-    if (selection.requires_uniform_scale()) {
-        m_uniform_scale = true;
-    }
-
     update_reset_buttons_visibility();
     //update_mirror_buttons_visibility();