POOL API block hash is wrong
I have deployed v45 and i have noticed that the reported block hash from the api is one count further then the actual network block height.

### Steps to Reproduce

install v45

### Expected behavior

Needs to report the actual block height

### Actual behavior

Gives a block height that is not mined yet

### Reproduces how often
every time

### Version

v45 ubuntu

### Additional Information

API report:
-----------

networkStats |  
-- | --
networkType | "Main"
networkHashrate | 2758143.208152808
networkDifficulty | 196704.422265095
nextNetworkTarget | "00000002aa550000000000000000000000000000000000000000000000000000"
nextNetworkBits | "1d02aa55"
lastNetworkBlockTime | "2019-03-22T07:33:33.6107181Z"
blockHeight | 573730



explorer report:
-------------------
https://screenshots.firefox.com/PKIoSaT9QbdZA4Ku/explorer.bitcoingold.org