fix isAdmin in admin/index action

Author: bscheshirwork

views/admin/index.php

@@ -117,15 +117,15 @@
             'template' => '{switch} {resend_password} {update} {delete}',
             'buttons' => [
                 'resend_password' => function ($url, $model, $key) {
-                    if ($model->isAdmin) {
+                    if (\Yii::$app->user->identity->isAdmin && !$model->isAdmin) {
                         return '
                     <a data-method="POST" data-confirm="' . Yii::t('user', 'Are you sure?') . '" href="' . Url::to(['resend-password', 'id' => $model->id]) . '">
                     <span title="' . Yii::t('user', 'Generate and send new password to user') . '" class="glyphicon glyphicon-envelope">
                     </span> </a>';
                     }
                 },
                 'switch' => function ($url, $model) {
-                    if($model->isAdmin && $model->id != Yii::$app->user->id && Yii::$app->getModule('user')->enableImpersonateUser) {
+                    if(\Yii::$app->user->identity->isAdmin && $model->id != Yii::$app->user->id && Yii::$app->getModule('user')->enableImpersonateUser) {
                         return Html::a('<span class="glyphicon glyphicon-user"></span>', ['/user/admin/switch', 'id' => $model->id], [
                             'title' => Yii::t('user', 'Become this user'),
                             'data-confirm' => Yii::t('user', 'Are you sure you want to switch to this user for the rest of this Session?'),