Review CSS border radius and button sizes based on recent update on MapStore

[allyoucanmap]

This MapStore PR geosolutions-it/MapStore2#11425 uniformed sizes of buttons using only square-button class.

Needed actions:

• Update the MapStore submodule to the latest master
• Remove all the square-button-md and square-button-sm with square-button classes in the custom code
• Verify the new style is not breaking the GeoNode layout