Fix issue #2306 (Recent projects close arrow fail to close without mouse move)

This is a possible fix for issue #2306. It changes `click` to `mouseup` as the event to close an entry in the list of recent projects.

It seems that jquery `click` event is not triggered if the mouse is already over the svg element when the old one is removed and the new one rendered, but `mouseup` is.

I'd say it has something to do with the lack of `mouseenter`, but I haven't been able to replicate it anywhere else outside this.