Remove instances of +1 SRS point needed

[ludamad]

this was only for plonk and causes issues if powers of 2 are used in honk

[ludamad]

This is still needed by the ECCVM, so the concept of adding one to the circuit size can't be removed entirely but could be scoped better (not unconditional in CommitmentKey)

[ledwards2225]

Closed by AztecProtocol/aztec-packages#20912