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

[sqrrm]

Changes look reasonable but while running I notice that the `awaiting blocks... Verified nnn blocks out of mmm` is now counting out both the verified number and the total expected.

![Screenshot_2019-09-02_00-07-13](https://user-images.githubusercontent.com/23560607/64082850-1530b900-cd16-11e9-94c6-86165be7fe67.png)
![Screenshot_2019-09-02_00-07-30](https://user-images.githubusercontent.com/23560607/64082849-1530b900-cd16-11e9-97f8-012fb7f0da4a.png)
![Screenshot_2019-09-02_00-07-42](https://user-images.githubusercontent.com/23560607/64082848-1530b900-cd16-11e9-86a1-d4786f46b612.png)
![Screenshot_2019-09-02_00-07-59](https://user-images.githubusercontent.com/23560607/64082847-14982280-cd16-11e9-9417-492660ff6ce8.png)


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