[Ottersec] Set ExcessBlobGas in getHeader to avoid nil pointer issue

[yzang2019]

Describe your changes and provide context

This PR is aiming to fix the ottersec issue: When executing BLOBBASEFEE within eth_estimateGas, since it doesn’t set ExcessBlobGas here, blobBaseFee also remains unset in NewEVMBlockContext, leading to a nil pointer dereference at opBlobBaseFee.

Testing performed to validate your change