IR: `morph.consensus.peers.min` config defaults incorrectly

[cthulhu-rider]

seems like declared default behavior of https://github.com/nspcc-dev/neofs-node/blob/c408b57ee6a42dd112b7ef91033c2820c7dfeb87/config/example/ir.yaml#L68 config doesn't work

when config key min is ommited, final used value must be calculated from committee array size. E.g. for 4 committee members min must default to 2