Fix schedule.php SCHEDULE_KEY logic use as a parameter.

Current logic does not check $argv and only checks $_REQUEST['key'] .
Added in $argv logic whilst retaining the ?key= functionality.
The original WCD instructions state that it should be used as a
parameter but I cannot see how this would ever work. This code
allows SCHEDULE_KEY to be used as a parameter via cron.

sections/schedule/index.php

   }
 }
 
-if ((!isset($_REQUEST['key']) || $_REQUEST['key'] != SCHEDULE_KEY) && !$AS) {
+if ($_REQUEST['key'] != SCHEDULE_KEY && $argv[1]!=SCHEDULE_KEY && !$AS) {
   error(403);
 }