rename onclick_only to provided_onclick_only in dioxus_router's Link

[valyagolev]

otherwise it doesn't work :)

this is needed to allow cmd-clicking link. working example:

#[component]
fn Link<'a>(cx: Scoped<'a>, class: Option<&'a str>, to: Route, children: Element<'a>) -> Element {
    let navigator = use_navigator(&cx);

    let eval_provider = use_eval(cx);

    let to_url = to.to_string();

    cx.render(rsx! {
        dioxus_router::prelude::Link {
            class: class.unwrap_or(""),
            to: to.clone(),
            onclick: move |e: Event<MouseData>| {
                let ms = e.data.modifiers();
                
                if ms.meta() || ms.ctrl() {
                    if let Err(e) = eval_provider(&format!("
                        window.open('{to_url}', '_blank');
                    ")) {
                        eprintln!("Error evaluating JS: {e:?}");
                    };
                } else {
                    navigator.push(to.clone());
                }
            },
            provided_onclick_only: true,
            children
        }
    })
}

btw, what would you say if I add this example code to Link as well? (in a separate PR). I think it's important to allow cmd-click for opening in new tabs. I only ever worked with Liveview though, so may be missing something

actually, window.open doesn't allow the focus to be retained in the original tab anymore. so without some prevent_default hackery, I'll have to resort to the normal a here. anyway, this particular PR might still be of value, if this attribute is to be around

[ealmloff]

Once #85 is resolved we can fix ctrl-clicking links. We need to conditionally enable prevent default if the control key was pressed which is currently not possible