test(FTA Audit File): drop redundant tearDown override

ERPNextTestSuite already calls frappe.db.rollback() in its base
tearDown; overriding (even with the same call) trips the
semgrep "Dont-override-teardown" rule.

erpnext/regional/doctype/fta_audit_file/test_fta_audit_file.py

@@ -253,6 +253,3 @@ class TestFTAAuditFile(FrappeTestCase):
 		self.assertTrue(result["success"])
 		doc.reload()
 		self.assertEqual(doc.status, "Submitted")
-
-	def tearDown(self):
-		frappe.db.rollback()