No required indicator

Problem/Motivation

When the geofield field is required and the "Hide Lat/Lon Coordinates Input" option is checked we lose the FE validation and receive the "This value should not be null." error which is non-informative enough.

Steps to reproduce

* Create a required - "Geofield" type field;
* Set the "Geofield Map" widget;
* Enable the "Hide Lat/Lon Coordinates Input" option.
* Go to the entity and try to save it.

Proposed resolution

Add the visual indicator to the fieldset to show that field is required when the lat and lon fields are hidden.