The current prob_cost_factor setting does not seem to make mu very
effective, in fact, it gives strange results:
plugin-cln-askrene: notify msg unusual: The flows had a fee of 151950msat, greater than max of 53697msat, retrying with mu of 10%...
plugin-cln-askrene: notify msg unusual: The flows had a fee of 220126msat, greater than max of 53697msat, retrying with mu of 20%...
We would expect increasing mu to *reduce* the fee!
As a first step, simplify (it can't be infinite, and the -1 are weird).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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