Fix block number field in nft events (#1304)

Brief comments on the purpose of your changes:


*For Dune Engine V2*
I've checked that:

* [ ] I tested the query on dune.com after compiling the model with dbt compile (compiled queries are written to the target directory)
* [ ] I used "refs" to reference other models in this repo and "sources" to reference raw or decoded tables 
* [ ] if adding a new model, I added a test
* [ ] the filename is unique and ends with .sql
* [ ] each sql file is a select statement and has only one view, table or function defined  
* [ ] column names are `lowercase_snake_cased`

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spellbook/models/looksrare/ethereum/looksrare_ethereum_events.sql

@@ -140,6 +140,7 @@ SELECT DISTINCT
     looks_rare.contract_address AS project_contract_address,
     agg.name AS aggregator_name,
     agg.contract_address AS aggregator_address,
+    looks_rare.block_number,
     tx_hash,
     tx.from AS tx_from,
     tx.to AS tx_to,

spellbook/models/opensea/ethereum/opensea_ethereum_schema.yml

@@ -409,4 +409,5 @@ models:
       - *block_number
       - *tx_from
       - *tx_to
-      - *unique_trade_id
+      - name: unique_trade_id
+        description:  "Unique trade ID"