Remove erroneous reassignment in log_index_add_log_entries

[0xxFloki]

remove the accidental log_index = Uint(0) that overwrote the LogIndexState and broke indexing, ensure log indexing uses the passed state so prepare/add/advance operate correctly

[eth-bot]

File EIPS/eip-7745.md

Requires 1 more reviewers from @g11tech, @jochem-brouwer, @lightclient, @samwilsn, @xinbenlv