XRPL SignerListSet quorum is incorrect

[surangap]

currently the quorum is taken as (previous validator count - 1)
It should be (new validator count -1)

in LN ->

trn-seed/pallet/xrpl-bridge/src/lib.rs

Line 653 in 5e20084

 let signer_quorum: u32 = T::EthyAdapter::xrp_validators().len().saturating_sub(1) as u32;