Fixed issue #2294. (#2361)
Fixed issue #2294. (#2361)

* Fixed issue #2294.
https://github.com/stratisproject/StratisBitcoinFullNode/issues/2294#issue-364513736

* moved the fix into ProcessDownloadQueueLocked method

fassadlr/StratisBitcoinFullNode,quantumagi/StratisBitcoinFullNode,Aprogiena/StratisBitcoinFullNode,bokobza/StratisBitcoinFullNode,bokobza/StratisBitcoinFullNode,Aprogiena/StratisBitcoinFullNode,mikedennis/StratisBitcoinFullNode,fassadlr/StratisBitcoinFullNode,Neurosploit/StratisBitcoinFullNode,Neurosploit/StratisBitcoinFullNode,bokobza/StratisBitcoinFullNode,mikedennis/StratisBitcoinFullNode,mikedennis/StratisBitcoinFullNode,bokobza/StratisBitcoinFullNode,Neurosploit/StratisBitcoinFullNode,stratisproject/StratisBitcoinFullNode,quantumagi/StratisBitcoinFullNode,Aprogiena/StratisBitcoinFullNode,stratisproject/StratisBitcoinFullNode,mikedennis/StratisBitcoinFullNode