Fix ID mismatch in keyboard.js

- Mismatch introduced in 2487866

Bug: 1029954
Test: Manual
Change-Id: I422bc73c0f04232f011e6f29835b3ae304348ae7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2496037Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Michael Irani <michaelirani@chromium.org>
Auto-Submit: Michael Irani <michaelirani@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820532}

chrome/browser/resources/settings/chromeos/device_page/keyboard.js

@@ -188,7 +188,7 @@ cr.define('settings', function() {
         id = '#showLanguagesInput';
       } else {
         path = settings.routes.OS_LANGUAGES_DETAILS.path;
-        id = '#showLanguageDetails';
+        id = '#showLanguagesDetails';
       }
 
       this.focusConfig.set(path, () => {