Fixing yewstack#2911

Prevents Link onclick behaviour from executing if the Ctrl key (for
Windows and Linux) or Meta Key (For Mac) is pressed.

This technically introduces a bug that means that links will reload the
page on windows machines when the windows key is held down. However,
this error is also in React Router, so I think we can get away with it.

See:
https://github.com/remix-run/react-router/blob/11156ac7f3d7c1c557c67cc449ecbf9bd5c6a4ca/packages/react-router-dom/dom.ts#L29

packages/yew-router/src/components/link.rs

@@ -55,8 +55,10 @@ where
         let query = query.clone();
 
         Callback::from(move |e: MouseEvent| {
+            if e.meta_key() || e.ctrl_key() {
+               return;
+            }
             e.prevent_default();
-
             match query {
                 None => {
                     navigator.push(&to);