Fix: allow key length of 40 for older users

Author: tyeth

src/provisioning/Config.h

@@ -23,7 +23,7 @@ struct secretsConfig {
   networkConfig network;
   char aio_url[64];
   char aio_user[31];
-  char aio_key[33];
+  char aio_key[41];
   int io_port;
   float status_pixel_brightness;
 };