fix: update role in Avatar

Author: shinokada

src/lib/avatar/Avatar.svelte

@@ -18,7 +18,7 @@
 </script>
 
 {#if !src || !!href || children || dot}
-  <svelte:element this={href ? "a" : "div"} role={href ? "link" : "img"} {onclick} {href} {target} {...restProps} class={avatarClass}>
+  <svelte:element this={href ? "a" : "div"} role={href ? undefined : "button"} {onclick} {href} {target} {...restProps} class={avatarClass}>
     {#if src}
       <img {alt} {src} class={cornerStyle === "circular" ? "rounded-full" : "rounded"} />
     {:else if children}