Fix unhandled permissions exception in bpy.utils.is_path_builtin

An excepting would be raised when the parent/child paths didn't
have permissions to access.

scripts/modules/bpy/utils/__init__.py

@@ -602,6 +602,9 @@ def _is_path_parent_of(parent_path, path):
     except ValueError:
         # Happens on Windows when paths don't have the same drive.
         pass
+    except PermissionError:
+        # When either of the paths don't have permissions to access.
+        pass
 
     return False