Double-reservation in the `withdraw` flow

[enaples]

Issue description

After used withdraw <addr> all slow, I've got a transaction broadcasting error due to feerate limit 251 < 253. I was expecting the inputs were rolled back to unreserved, however the input remained reserved.

Root Cause

1. withdraw --> fundpsbt --> reserve UTXOs for 72 blocks
2. signpsbt
3. sendpsbt --> re-reserves for 72 more blocks
4. sendrawtransaction (failed due to feerate < mempoolminfee)
5. sendpsbt_done (failure path, walletrpc.c:1004-1018 unreserves its own 72 blocks

However, the fundpsbt reservation is never cleaned up. Fund are stuck as reserved.

[madelinevibes]

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