Fix bootstrap-theme not disabling on Firefox

inc/header.inc.php

@@ -55,10 +55,10 @@ if (is_dir(HESK_PATH . 'install')) {
     <link href="<?php echo HESK_PATH; ?>css/datepicker.css" type="text/css" rel="stylesheet"/>
     <link href="<?php echo HESK_PATH; ?>css/bootstrap.css?v=<?php echo MODS_FOR_HESK_BUILD; ?>" type="text/css"
           rel="stylesheet"/>
+    <?php if ($modsForHesk_settings['use_bootstrap_theme'] == 0) { ?>
     <link href="<?php echo HESK_PATH; ?>css/bootstrap-theme.css?v=<?php echo MODS_FOR_HESK_BUILD; ?>" type="text/css"
-          rel="stylesheet" <?php if ($modsForHesk_settings['use_bootstrap_theme'] == 0) {
-        echo 'disabled';
-    } ?>>
+          rel="stylesheet" />
+    <?php } ?>
     <link href="<?php echo HESK_PATH; ?>css/mods-for-hesk.css?v=<?php echo MODS_FOR_HESK_BUILD; ?>" type="text/css"
           rel="stylesheet"/>
     <link href="<?php echo HESK_PATH; ?>css/hesk_newStyle.css?v=<?php echo MODS_FOR_HESK_BUILD; ?>" type="text/css"