init: don't suggest -reindex-chainstate for recovery on a pruned node #35849

When chainstate loading fails, init offers to rebuild the databases and, if declined, suggests restarting with -reindex or -reindex-chainstate.

On a pruned node -reindex-chainstate cannot recover: it rebuilds the chainstate by replaying existing block data, which has been pruned, and the node already rejects it with "Prune mode is incompatible with -reindex-chainstate. Use full -reindex instead." Only a full -reindex recovers a pruned node.

Omit -reindex-chainstate from the suggestion when pruning is enabled.

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For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/35849.

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