[1.7.x] Fixed #22498 -- constraint name was not quoted in FK creation SQL

Backport of 843613add4 from master

django/db/backends/schema.py

@@ -419,11 +419,11 @@ class BaseDatabaseSchemaEditor(object):
             to_column = field.rel.to._meta.get_field(field.rel.field_name).column
             self.deferred_sql.append(
                 self.sql_create_fk % {
-                    "name": '%s_refs_%s_%x' % (
+                    "name": self.quote_name('%s_refs_%s_%x' % (
                         field.column,
                         to_column,
                         abs(hash((model._meta.db_table, to_table)))
-                    ),
+                    )),
                     "table": self.quote_name(model._meta.db_table),
                     "column": self.quote_name(field.column),
                     "to_table": self.quote_name(to_table),