ve.dm.MWMapsNode: Don't hard-code server and style
ve.dm.MWMapsNode: Don't hard-code server and style

Use the config vars instead.

Bug: T193583
Change-Id: Ibd8a323539e20a277a8085c3dfc5b0ffe133ae1a

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