[openstreetmap-website] Unconditionally unbind moveend event (#614)

[John Firebaugh]

Can't rely on checking location.pathname -- inside unload, it already contains
the new path. Fortunately, checking is unnecessary.

Fixes TypeError: Cannot call method 'split' of undefined.
You can merge this Pull Request by running:

  git pull https://github.com/jfirebaugh/openstreetmap-website history-fix

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/614

-- Commit Summary --

  * Unconditionally unbind moveend event

-- File Changes --

    M app/assets/javascripts/index/history.js (5)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/614.patch
https://github.com/openstreetmap/openstreetmap-website/pull/614.diff
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