Change full_schemas/11 to work with postgres

synapse/storage/schema/delta/16/events_order_index.sql

synapse/storage/schema/full_schemas/11/event_edges.sql

synapse/storage/schema/full_schemas/11/event_signatures.sql

synapse/storage/schema/full_schemas/11/im.sql

synapse/storage/schema/full_schemas/11/keys.sql

synapse/storage/schema/full_schemas/11/media_repository.sql

synapse/storage/schema/full_schemas/11/presence.sql

synapse/storage/schema/full_schemas/11/redactions.sql

synapse/storage/schema/full_schemas/11/state.sql

synapse/storage/schema/full_schemas/11/transactions.sql

synapse/storage/schema/full_schemas/11/users.sql

synapse/storage/schema/full_schemas/16/im.sql

synapse/storage/schema/full_schemas/16/state.sql