renepay fell over

first i tried to pay an invoice with `any` amount

```
[nifty@pps:~]$ lightning-cli renepay LNBC1PN2...RTR 400000
# Sent route request: partid=1 amount=400000msat prob=1.000 fees=1040msat delay=442 path=
# Sent route request: partid=2 amount=400000msat prob=1.000 fees=1040msat delay=442 path=
# Sent route request: partid=3 amount=400000msat prob=1.000 fees=1040msat delay=442 path=
# Sent route request: partid=4 amount=400000msat prob=1.000 fees=1040msat delay=442 path=
# Sent route request: partid=5 amount=400000msat prob=1.000 fees=1040msat delay=482 path=
# Sent route request: partid=6 amount=400000msat prob=1.000 fees=1040msat delay=442 path=
# Sent route request: partid=7 amount=400000msat prob=1.000 fees=1040msat delay=442 path=
# Sent route request: partid=8 amount=400000msat prob=1.000 fees=1040msat delay=442 path=
# Sent route request: partid=9 amount=400000msat prob=1.000 fees=1040msat delay=442 path=
{
"code": 210,
"message": "Timed out"
}
```

then i try it again, except with 400k sats, not 400. now it says it can't find the destination!

```
[nifty@pps:~]$ lightning-cli renepay LNBC1PN2...4RTR 400000sat{
"code": 205,
"message": "Destination is unknown in the network gossip."
}
```

then i try the same command again, and it says the plugin has died.

```
[nifty@pps:~]$ lightning-cli renepay LNBC1PN2CD...6T4RTR 400000sat
# Sent route request: partid=1 amount=400000msat prob=1.000 fees=1040msat delay=442 path=
{
"code": -4,
"message": "Plugin terminated before replying to RPC call."
}
```

current version of core-lightning:
"version": "v24.05",