Cleanup: simplify sorting during uv packing

Prevent double-sorting during uv packing with bounding-box packing.

Slight speed improvement, slight packing efficiency improvement.

source/blender/python/mathutils/mathutils_geometry.c

@@ -1404,8 +1404,9 @@ static PyObject *M_Geometry_box_pack_2d(PyObject *UNUSED(self), PyObject *boxlis
       return NULL; /* exception set */
     }
 
+    const bool sort_boxes = true; /* Caution: BLI_box_pack_2d sorting is non-deterministic. */
     /* Non Python function */
-    BLI_box_pack_2d(boxarray, len, &tot_width, &tot_height);
+    BLI_box_pack_2d(boxarray, len, sort_boxes, &tot_width, &tot_height);
 
     boxPack_ToPyObject(boxlist, boxarray);
     MEM_freeN(boxarray);