get_rectangular_perimeter to use get_x again #6364 (4260313)

Just restoring original behaviour before 4260313 when get_rectangular_perimeter prioritized x dimension.

src/bonsai/bonsai/bim/module/qto/calculator.py

@@ -291,7 +291,8 @@ def get_space_net_perimeter(obj: bpy.types.Object) -> float:
 
 
 def get_rectangular_perimeter(obj: bpy.types.Object) -> float:
-    length = get_length(obj, main_axis="x")
+    """Get object perimeter in XZ plane."""
+    length = get_x(obj)
     height = get_height(obj)
     return (length + height) * 2