Enforce trailing comma in JS on multiline (#30002)

To keep blame info accurate and to avoid [changes like
this](https://github.com/go-gitea/gitea/pull/29977/files#diff-c3422631a14edbe1e508c4b22f0c718db318be08a6e889427802f9b6165d88d6R359),
it's good to always have a trailing comma, so let's enforce it in JS.

This rule is completely automatically fixable with `make lint-js-fix`
and that's what I did here.

web_src/js/features/captcha.js

@@ -9,7 +9,7 @@ export async function initCaptcha() {
 
   const params = {
     sitekey: siteKey,
-    theme: isDark ? 'dark' : 'light'
+    theme: isDark ? 'dark' : 'light',
   };
 
   switch (captchaEl.getAttribute('data-captcha-type')) {
@@ -42,7 +42,7 @@ export async function initCaptcha() {
         siteKey: {
           instanceUrl: new URL(instanceURL),
           key: siteKey,
-        }
+        },
       });
       break;
     }