pat-inject: Minor code optimization.

Author: thet

src/pat/inject/inject.js

@@ -456,8 +456,7 @@ const inject = {
         if (cfg.sourceMod === "content") {
             $source = $source.contents();
         }
-        let $src;
-        $src = $source.safeClone();
+        const $src = $source.safeClone();
         for (const img of dom.querySelectorAllAndMe($src[0], "img")) {
             $(img).on("load", (e) => {
                 $(e.currentTarget).trigger("pat-inject-content-loaded");