freeciv: Update 2.5 version to 2.5.0-beta2

Signed-off-by: Marko Lindqvist <cazfi74@gmail.com>
freeciv: Adjust version 2.5 gtk3-client main menu size

Buttons fit on screen on smaller displays.

Signed-off-by: Marko Lindqvist <cazfi74@gmail.com>