ve-maps: Fix block map CE rendering
ve-maps: Fix block map CE rendering

Apply thumb styling, and render caption.

Change-Id: Icbe6b9c2e6a6f0ddd24916365ff1f28c3c76f67f

wikimedia/mediawiki-extensions-Kartographer,wikimedia/mediawiki-extensions-Kartographer,wikimedia/mediawiki-extensions-Kartographer