enable map preview zoom and fullscreen buttons

[rafaelchavesfreitas]

• [x] Zoom buttons

• [x] Fullscreen buttons

[rafaelchavesfreitas]

use fullscreen mode instead of modal: https://docs.mapbox.com/mapbox-gl-js/example/fullscreen/

[rafaelchavesfreitas]

I could not find the fullscreen button:

[hockpond]

It only appears on the post itself and on preview.

[hockpond]

I'll fix that, thanks.

[bwstefano]

Can we also have these buttons for maps added in posts? Such as at https://jeo.hacklab.com.br/wp-admin/post.php?post=327&action=edit

[bwstefano]

If I mouse over the zoom buttons, the plus and minus signs disappear, when only their backgrounds should be turned gray. See below: