fix(regional): set frappe.flags.company temporarily, where required

(cherry picked from commit 4205f564a0)

erpnext/utilities/regional.py

@@ -0,0 +1,13 @@
+from contextlib import contextmanager
+
+import frappe
+
+
+@contextmanager
+def temporary_flag(flag_name, value):
+	flags = frappe.local.flags
+	flags[flag_name] = value
+	try:
+		yield
+	finally:
+		flags.pop(flag_name, None)