wrong button height when repeating

[auipga]

If you are repeating the buttons very often by the line some of the heigt of some middle buttons are too little. I adjusted the line-heigt of a.button, button from 1.11 to 1.26. The overall heigt of the buttons is now 25 instead of 24 px. I found no value between 1.11 and 1.26 witch would match the 24px exact.

[erikbrannstrom]

This solved a problem I had where a button next to a a.btn would differ in size by 2 pixels in Firefox 5. The weird part is that it looked perfect in Mozilla Aurora, Chrome, Opera and Safari! In regard to that, I suggest merging this commit :)