Sessionid is an int

With the extra memcache check now this could cause issues otherwise.

Signed-off-by: Roeland Jago Douma <[email protected]>

lib/Controller/PublicSessionController.php

@@ -80,7 +80,7 @@ public function create(string $token, string $file = null, $guestName = null, bo
 	 * @NoAdminRequired
 	 * @PublicPage
 	 */
-	public function fetch(int $documentId, string $sessionId, string $sessionToken): Response {
+	public function fetch(int $documentId, int $sessionId, string $sessionToken): Response {
 		return $this->apiService->fetch($documentId, $sessionId, $sessionToken);
 	}