minor bugfix

The PR#1099 was merged assuming that EEST is going to send block_hash keys as hex string sin the future.
But this seems to not be the case atleast thus far.

Author: gurukamath

src/ethereum_spec_tools/evm_tools/t8n/env.py

@@ -294,22 +294,17 @@ def read_block_hashes(self, data: Any, t8n: "T8N") -> None:
         # Read the block hashes
         block_hashes: List[Any] = []
 
-        # The hex key strings provided might not have standard formatting
-        clean_block_hashes: Dict[int, Hash32] = {}
-        if "blockHashes" in data:
-            for key, value in data["blockHashes"].items():
-                int_key = int(key, 16)
-                clean_block_hashes[int_key] = Hash32(hex_to_bytes(value))
-
         # Store a maximum of 256 block hashes.
         max_blockhash_count = min(Uint(256), self.block_number)
         for number in range(
             self.block_number - max_blockhash_count, self.block_number
         ):
-            if number in clean_block_hashes.keys():
-                block_hashes.append(clean_block_hashes[number])
+            if "blockHashes" in data and str(number) in data["blockHashes"]:
+                block_hashes.append(
+                    Hash32(hex_to_bytes(data["blockHashes"][str(number)]))
+                )
             else:
-                block_hashes.append(None)
+                    block_hashes.append(None)
 
         self.block_hashes = block_hashes