Changed the Content Warning field to be shown based solely on whether there is already a content warning on the toot being replied to.

src/components/compose.jsx

@@ -328,7 +328,7 @@ function Compose({
           prefs['posting:default:language']?.toLowerCase() ||
           DEFAULT_LANG,
       );
-      setSensitive(sensitive || spoilerText);
+      setSensitive(!!spoilerText);
     } else if (editStatus) {
       const { visibility, language, sensitive, poll, mediaAttachments } =
         editStatus;