Fix the tooltip example (#154)

Author: uwemaurer

sites/floating-ui-svelte.vercel.app/src/routes/(inner)/examples/tooltips/Example.svelte

@@ -23,7 +23,7 @@ const floating = useFloating({
 	get open() {
 		return open;
 	},
-	onOpenChange: (v) => (v) => {
+	onOpenChange: (v) => {
 		open = v;
 	},
 	placement: "top",