[openstreetmap/openstreetmap-website] Fix listener leak in the link update listener of MapLibre.AttributionControl (PR #7191)

[Frank Elsinga]

### Description

Splits out another change from my branch that I should have added to #7189 but overlooked

`OSM.MapLibre.AttributionControl` does not properly clean up after itsself because the functions are considered differnt due to `this` being a differnt object.

### How has this been tested?

Attribution attributes on the export page 😉

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

  https://github.com/openstreetmap/openstreetmap-website/pull/7191

-- Commit Summary --

  * Fix moveend listener leak in MapLibre AttributionControl

-- File Changes --

    M app/assets/javascripts/maplibre/attribution.js (5)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/7191.patch
https://github.com/openstreetmap/openstreetmap-website/pull/7191.diff

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