topic_mute: Fix options not appearing

Not intended to laugh at the user, I promise ;_; Was running into a bug
due to too much usage of empty() to coerce variables into booleans.

plugin/topic_mute/src/Subs-TopicMute.php

@@ -25,7 +25,6 @@ function topic_is_muted($topic, $user = -1)
 {
     global $context, $smcFunc, $user_info;
     if ($user_info['is_guest']) {
-        die('lol');
         return false;
     }
 
@@ -115,15 +114,17 @@ function mute_theme_option()
     }
 
     $option = array(
+        array(
             'id' => 'topic_mute_roadblock',
             'label' => $txt['topic_mute_roadblock'],
             'default' => false,
+        ),
     );
 
     $context['theme_options'] = array_merge(
-        array_slice($context['theme_options'], 0, $posting_idx - 1, true),
+        array_slice($context['theme_options'], 0, $posting_idx, true),
         $option,
-        array_slice($context['theme_options'], $posting_idx - 1, null, true),
+        array_slice($context['theme_options'], $posting_idx, null, true),
     );
 }
 

plugin/topic_mute/src/languages/TopicMute.english.php

@@ -2,6 +2,6 @@
 
 $txt['mute_topic'] = 'Mute Topic';
 $txt['unmute_topic'] = 'Unmute Topic';
-$txt['topic_mute_roadblock'] = 'Present an option to show muted threads';
+$txt['topic_mute_roadblock'] = 'Hide the option to show muted threads';
 
 ?>