This should allow any type to be used as Delta... (#325)

* This should allow any type to be used as Delta, beyond native numerical types.
* Why write more code than you have to?

src/entt/process/process.hpp

@@ -188,7 +188,7 @@ public:
             current = state::ABORTED;
 
             if(immediately) {
-                tick(0);
+                tick({});
             }
         }
     }