add decryptall.php

settings/ajax/decryptall.php

+<?php
+
+$status = OC_App::isEnabled('files_encryption');
+OC_App::enable('files_encryption');
+
+OCA\Encryption\Crypt::decryptAll();
+
+if ($status === false) {
+	OC_App::disable('files_encryption');
+}
+
+
+\OCP\JSON::success(array('data' => array('message' => 'looks good')));
+