Fix typo in update check function

[Gnarfoz]

Typo causing the array to become invalid.

[Gnarfoz]

Results in errors like this:

PHP Fatal error:  Uncaught ValueError: curl_setopt_array(): Argument #2 ($options) must contain only valid cURL options in /var/www/forum/ext/paybas/pbwowext-3.2.8/core/admin.php:45
Stack trace:
#0 /var/www/forum/ext/paybas/pbwowext-3.2.8/core/admin.php(45): curl_setopt_array()
#1 /var/www/forum/ext/paybas/pbwowext-3.2.8/acp/pbwow_module.php(345): paybas\pbwowext\core\admin->curl()
#2 /var/www/forum/ext/paybas/pbwowext-3.2.8/acp/pbwow_module.php(69): paybas\pbwowext\acp\pbwow_module->version_check()
#3 /var/www/forum/includes/functions_module.php(676): paybas\pbwowext\acp\pbwow_module->main()
#4 /var/www/forum/adm/index.php(81): p_master->load_active()
#5 {main}
  thrown in /var/www/forum/ext/paybas/pbwowext-3.2.8/core/admin.php on line 45