Removed unused variable that was detected by coverity.

Refs #10472

Code/Mantid/Framework/MDAlgorithms/inc/MantidMDAlgorithms/Quantification/Resolution/TobyFitResolutionModel.h

@@ -134,8 +134,6 @@ namespace Mantid
 
       /// Storage for currently in use random number generators
       mutable std::vector<Kernel::NDRandomNumberGenerator*> m_randomNumbers;
-      /// The value to mark an attribute as active
-      int m_activeAttrValue;
       /// Check for convergence after loop min number of steps
       int m_mcLoopMin;
       /// Maximum number of Monte Carlo evaluations