Quit button is too close to icon in task bar

i had this too often: i clicked on the icon in the taskbar, and unintentially did a doubleclick, which shut down the bitmask client because the "Quit" button is right at the place where the icon in the taskbar is located. Please move it a bit away from the taskbar so this don't happen.

(from redmine: created on 2014-10-29, closed on 2016-05-04)