bugfix [#24087] Blender can not install add-ons unless running with root priviledges

now addon path is created using the same path functions and selecting where to save the startup.blend

also made some minor changes to path handling funcs.

release/scripts/modules/bpy/utils.py

@@ -27,7 +27,7 @@ import bpy as _bpy
 import os as _os
 import sys as _sys
 
-from _bpy import blend_paths
+from _bpy import blend_paths, user_resource
 from _bpy import script_paths as _bpy_script_paths