Fixed error in 'getbalance' when using watchonly addresses.
Fixed error in 'getbalance' when using watchonly addresses.

(cherry picked from commit d512534cd71ebdb67bf0cb2a377dc7c2b06ba438)

# Conflicts:
#	src/wallet.cpp

reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin,reddcoin-project/reddcoin