Revert: use exact solution again

Author: SebKrantz

src/models/solve_allocation_by_duality_cgc.jl

@@ -245,7 +245,7 @@ function hessian_duality_cgc(
             end
 
             # Assign result
-            values[ind] = -obj_factor * term + Random.rand() * 1e-6
+            values[ind] = -obj_factor * term # + Random.rand() * 1e-6
         end
     end
     return