[pallet-broker] Fix auto renew benchmarks (#6505)

Fix the broker pallet auto-renew benchmarks which have been broken since
#4424, yielding `Weightless` due to some prices being set too low, as
reported in #6474.

Upon further investigation it turned out that the auto-renew
contribution to `rotate_sale` was always failing but the error was
mapped. This is also fixed at the cost of a bit of setup overhead.

Fixes #6474

TODO:
- [x] Re-run weights

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Co-authored-by: GitHub Action <[email protected]>
Co-authored-by: command-bot <>
Co-authored-by: Bastian Köcher <[email protected]>