Suggestion: Enable region on main camera

[samrenfrew]

Have been playing around with this card recently (great work btw!) and I like seeing the regional highlight in the library view. Thinking it would be great to have an option to enable this in the main camera so can quickly spot what triggered the recording at a glance.

Tried doing it myself with a jinja2 template in card_mod - managed to get it to work but the only way to insert it is with a pseudo ::before tag, but this won't work on the main .aarlo-image element as psuedo-elements won't work on img tags