[App Management] Hide more settings for selected System Apps.

This CL corrects a regression which hides the more settings and
permission linkout.

Bug: 979531
Change-Id: I468734a201836b23c1d7943f139ff9090af45390
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1820401Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Jeevan Shikaram <jshikaram@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699224}

chrome/browser/resources/settings/chromeos/os_apps_page/app_management_page/chrome_app_permission_view.html

@@ -81,7 +81,8 @@
               based on the app. -->
         <div id="more-settings"
           class="permission-card-row separated-row header-text clickable"
-          on-click="onClickExtensionsSettingsButton_">
+          on-click="onClickExtensionsSettingsButton_"
+          hidden$="[[app_.hideMoreSettings]]">
           <div id="label" class="header-text">$i18n{moreSettings}</div>
           <div class="permission-row-controls">
             <cr-icon-button class="native-settings-icon icon-external" role="link"