Add visual indicator (ex. borders) to highlight selected map layer

[vnugent]

What would you like to be able to do? Please describe. When picking map layers I can't tell what layer is currently active.

How important is this to you (Please pick one)

• Nice-to-have

Tips:

• https://github.com/OpenBeta/open-tacos/blob/develop/src/components/maps/MapLayersSelector.tsx#L39-L53
• Check to see if mapKey === mapName then set img border to 2px. For example:

<img
  className={`w-12 h-12 md:w-16 md:h-16 rounded col-span-1 shadow  border-base-300', ${mapKey === mapName ? 'border-2': '' }`}
  src={imgUrl}
  alt='Currently selected maptiler layer'
/>