(Patch) Repeatedly right-clicking on icon brings up AWN context menu

Because of code in awn-task.c to prevent multiple fast clicks, making any kind of click on an icon, then following up immediately with a right-click, leads to the AWN bar's context menu to open, not the program icon's. This happens because the icon ignores multiple clicks in a small time period, and lets the clicks back to the bar behind it. This can be fixed by two methods. The last else clause in awn_task_button_press can be removed, causing the icon to absorb the second click within a small time period, doing nothing with it, but not letting it get back to the AWN bar. Or you can apply the attached path, which only considers fast clicks a problem on left-clicks.