Make client action menu safer to view

[AD7six]

So... I just drained a host unintentionally (:

I did so, I think, by accidentally double clicking the three dots to bring up the context menu:

The second click of which registered as a click on the first menu option:

Whilst what I describe is user error, it shouldn't be possible IMO to accidentally drain a node just by trying to bring up a context menu. A simple fix here would be to add a spacer to the top of the client-action menu such that when displayed the area above the three-dot button is not a new click handler to actually 'do' something.