[openstreetmap/openstreetmap-website] Hides the adding note option when the note layer is not active (PR #6890)

[Héctor Ochoa Ortiz]

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### Description
Would solve #867 by not showing the adding note button unless the note layer is active.

<img width="406" height="721" alt="image" src="https://github.com/user-attachments/assets/269e7118-c571-4619-9ad5-3524b9cbb091" />
<img width="406" height="721" alt="image" src="https://github.com/user-attachments/assets/90eef023-15f8-4648-a4a8-d20901d1256f" />


### How has this been tested?
Run locally via docker compose, open the locally hosted website in my browser.
Toggle the note layer via the layer panel, and the add note button appears and disappears.

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/6890

-- Commit Summary --

  * Disable add note option when the note layer is not active

-- File Changes --

    M app/assets/javascripts/leaflet.note.js (6)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6890.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6890.diff

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