[Client] Remove variable added by tes3mp to CellStore that is not used

apps/openmw/mwworld/cellstore.cpp

@@ -359,9 +359,6 @@ namespace MWWorld
         : mStore(esmStore), mReader(readerList), mCell (cell), mState (State_Unloaded), mHasState (false), mLastRespawn(0,0)
     {
         mWaterLevel = cell->mWater;
-
-        // Added by tes3mp
-        lastRefNumIndex = 0;
     }
 
     const ESM::Cell *CellStore::getCell() const

apps/openmw/mwworld/cellstore.hpp

@@ -75,9 +75,6 @@ namespace MWWorld
             std::vector<std::string> mIds;
             float mWaterLevel;
 
-            // Added by tes3mp
-            unsigned int lastRefNumIndex;
-
             MWWorld::TimeStamp mLastRespawn;
 
             // List of refs owned by this cell