fix: setup fails to set abbr to departments

(cherry picked from commit debe868950)

erpnext/setup/doctype/department/department.py

@@ -30,8 +30,7 @@ class Department(NestedSet):
 	nsm_parent_field = "parent_department"
 
 	def autoname(self):
-		root = get_root_of("Department")
-		if root and self.department_name != root:
+		if self.company:
 			self.name = get_abbreviated_name(self.department_name, self.company)
 		else:
 			self.name = self.department_name