message: Disable notification buttons after using them
diff: <div class="container" ng-controller="ServerStartedNotificationController">
  <div uib-alert ng-show="hackingProgress.autoRestoreMessage" ng-class="'alert alert-warning'" close="closeNotification()">
  <span translate="NOTIFICATION_SERVER_STARTED"></span>: {{hackingProgress.autoRestoreMessage}}
  - <button class="btn btn-primary btn-xs" ng-click="clearProgress()">
  + <button class="btn btn-primary btn-xs" ng-click="clearProgress()" ng-disabled="hackingProgress.cleared">
  <i class="fa fa-trash" aria-hidden="true"></i>
  <span translate="RESTART_REQUIRED" ng-show="hackingProgress.cleared"></span>
  <span translate="RESET_HACKING_PROGRESS" ng-show="!hackingProgress.cleared"></span>
  <div ng-show="showCtfFlagsInNotifications">
  <i class="fa fa-flag-checkered"></i> {{notification.flag}}
  - <button class="btn btn-primary btn-xs" ngclipboard data-clipboard-text="{{notification.flag}}" ngclipboard-success="notification.copied = true">
  + <button class="btn btn-primary btn-xs" ngclipboard data-clipboard-text="{{notification.flag}}" ngclipboard-success="notification.copied = true" ng-disabled="notification.copied">
  <i class="fa fa-clipboard" aria-hidden="true"></i>
  <span translate="COPY_SUCCESS" ng-show="notification.copied"></span>
  <span translate="COPY_TO_CLIPBOARD" ng-show="!notification.copied"></span>
  