[OsSettingsPeoplePage] Change user list button to use dom-if

Change the remove restricted user button to use dom-if instead of
hidden. Relevant to deep linking as its easier to deep link to visible
buttons if hidden buttons aren't rendered.

Bug: 1084154
Change-Id: I831dc8f69ab00ffc51771a327b2fdf8ea47ab559
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363551Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Daniel Classon <dclasson@google.com>
Cr-Commit-Position: refs/heads/master@{#799311}

chrome/browser/resources/settings/chromeos/os_people_page/user_list.html

@@ -60,10 +60,12 @@
               [[item.displayEmail]]
             </div>
           </div>
-          <cr-icon-button class="icon-clear"
-              hidden="[[shouldHideCloseButton_(disabled, item.isOwner)]]"
-              title="[[getRemoveUserTooltip_(item)]]" on-click="removeUser_">
-          </cr-icon-button>
+          <template is="dom-if"
+              if="[[!shouldHideCloseButton_(disabled, item.isOwner)]]">
+            <cr-icon-button class="icon-clear"
+                title="[[getRemoveUserTooltip_(item)]]" on-click="removeUser_">
+            </cr-icon-button>
+          </template>
         </div>
       </template>
     </div>