refactor: Use IntegrationTestCase in test_accounts_settings.py

Signed-off-by: David <dgx.arnold@gmail.com>

erpnext/accounts/doctype/accounts_settings/test_accounts_settings.py

@@ -1,9 +1,10 @@
 import unittest
 
 import frappe
+from frappe.tests import IntegrationTestCase
 
 
-class TestAccountsSettings(unittest.TestCase):
+class TestAccountsSettings(IntegrationTestCase):
 	def tearDown(self):
 		# Just in case `save` method succeeds, we need to take things back to default so that other tests
 		# don't break