Fix syntax error in download button label

app.py

@@ -1081,7 +1081,7 @@ with st.sidebar:
                 _fname = f"livepulse_{_rkey}_{_ts}.csv"
                 _csv_bytes = _dl_df.to_csv(index=False).encode("utf-8")
                 st.download_button(
-                    label=f"?"\u2b07 {_slabel} ({len(_dl_rows)} msgs)",
+                    label=f"\u2b07 {_slabel} ({len(_dl_rows)} msgs)",
                     data=_csv_bytes,
                     file_name=_fname,
                     mime="text/csv",