[Backport] Allow change map image from admin #3230
Merged
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References
This is a backport of AyuntamientoMadrid#1839
Objectives
site_customization/image.rb
jpeg content type
to allow replace this image.Visual Changes
Default map image BEFORE
![before](https://user-images.githubusercontent.com/631897/51536254-432e5080-1e4b-11e9-8ed5-98aa11d0f1e4.png)
Default map image AFTER
![after](https://user-images.githubusercontent.com/631897/51536255-44f81400-1e4b-11e9-8346-f6718ead9c20.png)