application.js: fix indentation

This file wants to use spaces only for indentation. However, by accident
I introduced tab characters (oh my, am I glad that I do not have to get
this reviewed on the Git mailing list) in 41436cc (application.js:
allow for relative URLs, 2025-03-15).

Let me fix that really quickly.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

assets/js/application.js

@@ -343,11 +343,11 @@ var Search = {
     (async () => {
       const pagefindURL =
         `${baseURLPrefix}pagefind/pagefind.js`
-	  // adjust the `baseURLPrefix` if it is relative: the `import`
-	  // is relative to the _script URL_ here, which is in /js/.
-	  // That is different from other uses of `baseURLPrefix`, which
-	  // replace `href` and `src` attributes which are relative to the
-	  // page itself that is outside of /js/.
+          // adjust the `baseURLPrefix` if it is relative: the `import`
+          // is relative to the _script URL_ here, which is in /js/.
+          // That is different from other uses of `baseURLPrefix`, which
+          // replace `href` and `src` attributes which are relative to the
+          // page itself that is outside of /js/.
           .replace(/^\.\//, '../')
       Search.pagefind = await import(pagefindURL);
       const options = {