Log correct tx counts in RPC sync mode
Log correct tx counts in RPC sync mode

The map of relevant transactions was being cleared too early, causing
all counts of relevant accepted wallet transactions from a block to
always be zero.  This is fixed by setting the map to nil after logs
have been emitted.

jrick/btcwallet,jrick/btcwallet,decred/dcrwallet,jrick/dcrwallet,jrick/dcrwallet,decred/dcrwallet