ref: consolidate icon file names

assets/resources.json

@@ -1,5 +1,5 @@
 {
-  "icon": "icon/icon.png",
+  "icon": "icon/icon_48.png",
   "close": "close.png",
   "delete": "delete.svg",
   "error": "error.svg",

src/tools/post-build.ts

@@ -48,7 +48,7 @@ type BuildStats = {
 // @license         ${pkg.license}
 // @author          ${pkg.author.name}
 // @copyright       ${pkg.author.name} (${pkg.author.url})
-// @icon            https://raw.githubusercontent.com/${repo}/${branch}/assets/icon/icon.png
+// @icon            https://raw.githubusercontent.com/${repo}/${branch}/assets/icon/icon_48.png
 // @match           https://music.youtube.com/*
 // @match           https://www.youtube.com/*
 // @run-at          document-start