SWT increased via Bug 484463 for Neon the toolbar size to display the
underline in the main toolbar correct.  This results in lost space. 

I suggest to remove the underline, as this makes the UI look better and
allow SWT to reduce the size again.



Change-Id: Ie3473e75482155b47b31454155103af1459589b2
Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com>