Width of the Top menu vs. placeholder for search box

Af first, here is the Website where I have the Problem:

http://www.skydive-leipzig.de

I deactivated the search box in the Navigation bar, but there still seems to be a “placeholder”, because if I increase the font size of the Navigation bar in that way that the last menu tag should be at the right end, it makes automatically a line break into a second line.

I`ve tried to fix as recommended here:

Link

but it doesn’ work.

Please, can anybody help to fix it.

THX,

Ralf