fix icon alt text

Signed-off-by: Arthur Lu <learthurgo@gmail.com>

scripts/config.js

@@ -109,7 +109,7 @@ function addDiskLine (fieldset, iconHref, bus, device, storage, storageOptions,
 
 	let icon = document.createElement("img");
 	icon.src = iconHref;
-	icon.alt = labelText;
+	icon.alt = `${bus} ${device}`;
 	field.append(icon);
 
 	let busLabel = document.createElement("label");