Reuse Route when Route errors with Insufficient_Fee

[ziggie1984]

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[ziggie1984]

I propose a feature request where we try the same route and hence the same channel pair if our rebalance attempt fails because of Insuffienct Fees.

We already do this for when the probing fails, so it would be good to add it when our first rebalance fails.

[ziggie1984]

hmm I guess when we want to take account for a feeupdate we could expand also to the other failures like:

time_lock_delta, min_htlc_msat max_htlc_msat

[ziggie1984]

This PR only considers changes in the cltv_delta and fee_update case.