Corrupt sql generated when bulk_create method is configured with on_conflict parameter

[zzl221000]

Describe the bug

In the sqlite engine, configuring update_fields will configure on_conflict for self.insert_query and self.insert_query_all, resulting in duplicate on conflict fields.

'INSERT INTO "fileevent" ("id","tn","date","url","status","create_at") VALUES (?,?,?,?,?,?) ON CONFLICT ("id", "id") DO UPDATE SET "url"=EXCLUDED."url","url"=EXCLUDED."url"'

To Reproduce
sqlite3 and use bulk api

Expected behavior

'INSERT INTO "fileevent" ("id","tn","date","url","status","create_at") VALUES (?,?,?,?,?,?) ON CONFLICT ("id") DO UPDATE SET "url"=EXCLUDED."url","url"=EXCLUDED."url"'