Relayer panics on IBC transfers if SETTLEMENT_CONFIG is not defined

[mtsitrin]

When relayer tries to relay packets, it panics if settlement_config not defined.

Feb 06 13:04:57 ip-172-31-34-224 bash[60151]: # ------------------------------ run the ibc relayer ----------------------------- #
Feb 06 13:04:57 ip-172-31-34-224 bash[60153]: ts=2023-02-06T13:04:57.580131Z lvl=info msg="Debug server listening" sys=debughttp addr=localhost:7597
Feb 06 13:04:57 ip-172-31-34-224 bash[60153]: ts=2023-02-06T13:04:57.589939Z lvl=info msg="Unrelayed destination packets" dst_chain_id=c-35 dst_channel_id=channel-0 seqs=1
Feb 06 13:04:57 ip-172-31-34-224 bash[60153]: panic: runtime error: invalid memory address or nil pointer dereference
Feb 06 13:04:57 ip-172-31-34-224 bash[60153]: [signal SIGSEGV: segmentation violation code=0x1 addr=0x338 pc=0x1259b21]
Feb 06 13:04:57 ip-172-31-34-224 bash[60153]: goroutine 69 [running]:
Feb 06 13:04:57 ip-172-31-34-224 bash[60153]: github.com/cosmos/relayer/v2/relayer.(*SettlementClient).GetLatestFinalizedStateHeight(0x0, {0xc000d16b28, 0x11})
Feb 06 13:04:57 ip-172-31-34-224 bash[60153]:         /home/ubuntu/dymension/relayer/relayer/settlement-client.go:59 +0x61
Feb 06 13:04:57 ip-172-31-34-224 bash[60153]: github.com/cosmos/relayer/v2/relayer.QueryLatestFinalizedStateHeight.func1()
Feb 06 13:04:57 ip-172-31-34-224 bash[60153]:         /home/ubuntu/dymension/relayer/relayer/query.go:43 +0x85
Feb 06 13:04:57 ip-172-31-34-224 bash[60153]: golang.org/x/sync/errgroup.(*Group).Go.func1()
Feb 06 13:04:57 ip-172-31-34-224 bash[60153]:         /home/ubuntu/go/pkg/mod/golang.org/x/[email protected]/errgroup/errgroup.go:75 +0x64
Feb 06 13:04:57 ip-172-31-34-224 bash[60153]: created by golang.org/x/sync/errgroup.(*Group).Go
Feb 06 13:04:57 ip-172-31-34-224 bash[60153]:         /home/ubuntu/go/pkg/mod/golang.org/x/[email protected]/errgroup/errgroup.go:72 +0xa5

Expected result: Relayer panic on start if settlement_config not defined