chore(desktop): remove redundant emoji section heading

Co-authored-by: Larry <627498bd4bd1f281a16431e3c6cce3b5c25b6692798c78672298aefbf2f8f8b5@buzz.block.builderlab.xyz>
Signed-off-by: Logan Johnson <loganj@squareup.com>

desktop/src/features/messages/ui/MessageComposer.tsx

@@ -513,7 +513,6 @@ function MessageComposerImpl({
       richText.getPlainTextAndCursor,
     ],
   );
-  // ── Emoji insertion ─────────────────────────────────────────────────
   const insertEmoji = React.useCallback(
     (emoji: string) => {
       if (!richText.editor) return;