Remove the 'session.disable_fallback' from the configuration template.

config-templates/config.php

@@ -292,12 +292,6 @@ $config = array(
      */
     'session.cookie.secure' => false,
 
-    /*
-     * When set to FALSE fallback to transient session on session initialization
-     * failure, throw exception otherwise.
-     */
-    'session.disable_fallback' => false,
-
     /*
      * Enable secure POST from HTTPS to HTTP.
      *