Update editor_ie.css


![dokuwiki_ckgedit_ie](https://f.cloud.github.com/assets/4036303/1399374/9766454a-3cb5-11e3-90b1-4ff251ba7682.PNG)
Hi, I change the width-parameter for the heading-DropDown and for the size-DropDown. So it hasn't this ugly line break if you are using the german language. See at the attached Image.