scripted-diff: Use blocks_path where possible

-BEGIN VERIFY SCRIPT-
  sed -i 's|].chain_path / "blocks"|].blocks_path|g' $(git grep -l chain_path)
-END VERIFY SCRIPT-

test/functional/feature_abortnode.py

@@ -25,7 +25,7 @@ class AbortNodeTest(BitcoinTestFramework):
         self.generate(self.nodes[0], 3, sync_fun=self.no_op)
 
         # Deleting the undo file will result in reorg failure
-        (self.nodes[0].chain_path / "blocks" / "rev00000.dat").unlink()
+        (self.nodes[0].blocks_path / "rev00000.dat").unlink()
 
         # Connecting to a node with a more work chain will trigger a reorg
         # attempt.