fixed gamma calculation to straining hypo

cpp/full_code/ornstein_uhlenbeck_process.hpp

@@ -54,8 +54,7 @@ class ornstein_uhlenbeck_process{
 
         inline double gamma(double kabs)
         {
-            return this->ou_gamma_factor*pow(kabs,2./3.)*this->kolmogorov_constant*sqrt(this->kolmogorov_constant/
-                           this->ou_energy_amplitude);
+            return this->ou_gamma_factor*pow(kabs,2./3.)*sqrt(this->ou_energy_amplitude);
         }