improvement(chunk-config): migrate unused default for consistency (#913)

Author: icecrasher321

apps/sim/db/migrations/0070_charming_wrecking_crew.sql

@@ -0,0 +1 @@
+ALTER TABLE "knowledge_base" ALTER COLUMN "chunking_config" SET DEFAULT '{"maxSize": 1024, "minSize": 1, "overlap": 200}';