Fix board_id formatting in seeed_xiao_esp32s3_sense.md

When using Circup, when the version of CP is out of date, the URL to the board's download page on CircuitPython.com displayed by Circup is determined by

```py
if board_id:
                url_download = f"https://circuitpython.org/board/{board_id}"
```

(source: https://docs.circuitpython.org/projects/circup/en/stable/_modules/circup.html#Module)

and currently the board_id and URL do not match.

Correct URL for this board is https://circuitpython.org/board/seeed_xiao_esp32s3_sense/ so the board_id in this file needs to be changed
from seeed_xiao_esp32_s3_sense
to seeed_xiao_esp32s3_sense

Author: Timeline8

_board/seeed_xiao_esp32s3_sense.md

@@ -1,6 +1,6 @@
 ---
 layout: download
-board_id: "seeed_xiao_esp32_s3_sense"
+board_id: "seeed_xiao_esp32s3_sense"
 title: "Seeed Studio XIAO ESP32S3 Sense Download"
 name: "Seeed Studio XIAO ESP32S3 Sense"
 manufacturer: "Seeed Studio"