[bitcoin/bitcoin] Add CMerkleTx::IsImmatureCoinBase method (#13631)

All but one call to `GetBlocksToMaturity` is testing it relative to 0
for the purposes of determining whether the coinbase tx is immature.
In such case, the value greater than 0 implies that the tx is coinbase,
so there is no need to separately test that status.

This names the concept for easy singular use.
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— Commit Summary —

* Add CMerkleTx::IsImmatureCoinBase method

— File Changes —

M src/wallet/rpcwallet.cpp (4)
M src/wallet/wallet.cpp (16)
M src/wallet/wallet.h (2)

— Patch Links —


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