Simple refactor to WalletRescanReserver to use wallet reference instead of pointer.
Complements #18259.
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@MarcoFalke fixed.
ACK 8f1b82561cae2fcc78bce6ca7bab81cd9561cf14
@promag Are you still working on this? If not, it can be closed.
@MarcoFalke rebased.
ACK fc289b7898fb90d4800675b69c0bb9b42df5599f