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wallet: Do not download cfilters before birthday.
Especially for spv wallets with a birthday, cfilters for blocks before the birthday are not used for anything as there can be no transactions before the wallet existed. Do not download them but check if we need them whenever doing a rescan from height.
closes #2498
Needs some tests. I did not add any checks to chain/sync but I suppose it makes sense there too. Is looking for the cfilters when rescanning good enough for imported keys? More info about this should be added to docs as well.