Fix active pixels overlay for Cycles viewport

It got missed in some of previous development.

Can not see a reason why the line needed to be removed, maybe just some
accident.

intern/cycles/integrator/path_trace_work.cpp

@@ -183,6 +183,8 @@ PassAccessor::PassAccessInfo PathTraceWork::get_display_pass_access_info(PassMod
   pass_access_info.use_approximate_shadow_catcher_background =
       kfilm.use_approximate_shadow_catcher && !kbackground.transparent;
 
+  pass_access_info.show_active_pixels = film_->get_show_active_pixels();
+
   return pass_access_info;
 }