Fix widget and update image

[KatieKeith]

Please make 2 changes to Better Recent Comments:

1. Replace the 2nd screenshot on https://wordpress.org/plugins/better-recent-comments/ with the attached, as the current one shows the old widget editor.
   

2. In the block widget area, the widget disappears when you click away from it. Please do something to make it visible so that people know where it is and can easily click on it to reveal the widget settings.
   

[amirition]

@Barn2 I tested this on my local website and a live one. When no widget is selected and you have clicked outside of the widget area, you can see the widget preview:

Could you please let me know on which website you were able to see this issue.

Thanks.