Fix typo

inc/header.inc.php

@@ -54,7 +54,7 @@ if (is_dir(HESK_PATH . 'install')) {
     <meta name="theme-color" content="<?php echo '#414a5c'; ?>">
     <link href="<?php echo HESK_PATH; ?>hesk_style.css?v=<?php echo MODS_FOR_HESK_BUILD; ?>" type="text/css" rel="stylesheet"/>
     <link href="<?php echo HESK_PATH; ?>css/datepicker.css" type="text/css" rel="stylesheet"/>
-    <link href="<?php if (!isset(modsForHesk_settings['bootswatch_theme']) || $modsForHesk_settings['bootswatch_theme'] == "DEFAULT") {
+    <link href="<?php if (!isset($modsForHesk_settings['bootswatch_theme']) || $modsForHesk_settings['bootswatch_theme'] == "DEFAULT") {
                           echo HESK_PATH . "css/bootstrap.css?v=" . MODS_FOR_HESK_BUILD;
                       } else {
                           echo $modsForHesk_settings['bootswatch_theme'];