[fzmp] Use double click to activate same as enter.

Still using this, it's great. might sound odd for a TUI based tool but my workflow sometimes is I have fzmp open in floating window via middle-click waybar mpris, then I do what I need to do, but I've setup my WM (sway) to use mouse a lot when I'm ultra lazy, so I'd like to at least be able to open it up, scroll and double click. This can be as simple as play the media, or can be expanded maybe with right click multi-selector, and depending what context it is, play media or add to playlist. What do you think?