ambient: Fix checkbox attribute

Needs to add $ to data-id attribute otherwise reads undefined.

Bug: b/161081423
Test: manual
Change-Id: I35fce415685645b5dbb5afa1df781374333f7311
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315802Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791289}

chrome/browser/resources/settings/chromeos/ambient_mode_page/ambient_mode_photos_page.html

@@ -25,7 +25,7 @@
         <cr-checkbox class="list-item"
             checked="[[item.checked]]"
             on-change="onCheckboxChange_"
-            data-id="[[item.albumId]]"
+            data-id$="[[item.albumId]]"
             label="[[item.title]]">
           [[item.title]]
         </cr-checkbox>