Added a superimposed padlock to the blurred screen

I added a superimposed padlock to make the screen less ambiguous and give your eyes something to focus on when you look at it (this was causing me a lot of eye strain). Maybe this would be best as a command-line toggleable option?
Are you sure you are checking the right thing here?
$lockfile will be always there, however, i3lock-icon.svg might not.