[bisq-network/bisq] Fix performance issue in BsqWalletService (#3177)

[sqrrm]

Made a video. The total used to be known at start, now it's changing, and the progress is not showing correctly.


![blocksync](https://user-images.githubusercontent.com/23560607/64101975-45f10c80-cd6f-11e9-8397-b092567bd09c.gif)



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