[video-toggle] Fixed aligning running before #main-panel exists

[MiepHD]

This can possibly break the plugin (and it did for me, multiple time) Cannot read properties of undefined. mainpanel.style.setProperty("--align", "0px");

this whole code block needs to be inside an apiLoaded closure, we can't guarantee that $('#main-panel') exists when this code is called

In other words, instead of being inside the default export function, it should be inside the setup function which is called only when the page is loaded

@MiepHD @th-ch plz fix

[Araxeus]

thanks