Update editor_ie.css


![dokuwiki_ckgedit_ie](https://f.cloud.github.com/assets/4036303/1399385/d2f050ba-3cb5-11e3-853a-2f4bae074b7f.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.