fix: remove duplicate blob_fields call in build_block

[eeemmmmmm]

Remove redundant second call to ctx.blob_fields(info) in build_block function. The blob_gas_used value was already computed on line 970 and reused correctly on line 1101, making the second call an unnecessary operation.

[cb-heimdall]

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[Ziqi52]

Remove redundant second call to ctx.blob_fields(info) in build_block function. The blob_gas_used value was already computed on line 970 and reused correctly on line 1101, making the second call an unnecessary operation.

wow

[refcell]

This looks correct to me. The blob gas used is computed using the execution info which isn't changed between these two computations, so the re-computation was just shadowing the previous earlier computation. Wish the original author left a comment to explain why this was done, but looks to be a no-op.