Merge bitcoin#1134: [Trivial] Remove a duplicate variable definition

d4a2c64 [Util] Remove a duplicate variable definition (warrows)

Pull request description:

  `nTimeSlotLength` was set twice to `15`. Line 182 and 192 of `chainparams.cpp`.

ACKs for top commit:
  random-zebra:
    utACK d4a2c64
  furszy:
    utACK d4a2c64

Tree-SHA512: 263c33f8d326840299ad8ae1848a46caabe5c687adf372dff80b2cd959df68acb15eca67e10fb7b1147c47796c50d684e569e7d5184a3603c7f402fd7111d66e

Author: furszy

src/chainparams.cpp

@@ -189,7 +189,6 @@ class CMainParams : public CChainParams
         nMasternodeCountDrift = 20;
         nMaxMoneyOut = 21000000 * COIN;
         nMinColdStakingAmount = 1 * COIN;
-        nTimeSlotLength = 15;           // 15 seconds
 
         /** Height or Time Based Activations **/
         nLastPOWBlock = 259200;