Disabling the button at editor

How can i disable the “google-analytics-opt-out” Button at the visual editor? While using bbpress with visual editor feature and anybody at the forum get this button i’d like to cut this.

I’ve tried this:

function myplugin_tinymce_buttons( $buttons ) {
  
  $remove = 'Analytics Opt-Out';
  
  if ( ( $key = array_search( $remove, $buttons ) ) !== false )
    unset( $buttons[$key] );

  return $buttons;
 }
add_filter( 'mce_buttons', 'myplugin_tinymce_buttons' );

it does not work

many thanks and regards
Henry