Fix second click popup issue (#1925)

Deleted one line from L.Popup to fix the issue described in Issue #1925
The click events doesn't propagate to the map when you click the close button so the _fakeStop called in disableClickPropagation disable the first real mapClick.

I tested propagation in Firefox 22 and Chrome 28.0.1500.95 and it seems to work.

lg

fastrde