Random Ray Adjoint Mode (#3191)

Co-authored-by: Paul Romano <paul.k.romano@gmail.com>

src/settings.cpp

@@ -301,6 +301,10 @@ void get_run_parameters(pugi::xml_node node_base)
       FlatSourceDomain::volume_normalized_flux_tallies_ =
         get_node_value_bool(random_ray_node, "volume_normalized_flux_tallies");
     }
+    if (check_for_node(random_ray_node, "adjoint")) {
+      FlatSourceDomain::adjoint_ =
+        get_node_value_bool(random_ray_node, "adjoint");
+    }
   }
 }