TINY-688: fixed button icon bug
TINY-688: fixed button icon bug

ETSI-CTI/TinySpecMCE,danielpunkass/tinymce,adaptiffdesigns/tinymce,MediehusetTek/tinymce,fillabs/TinySpecMCE,danielpunkass/tinymce,blakewallan/tinymce,leofeyer/tinymce,aduth/tinymce,jtark/tinymce,tinymce/tinymce,TeamupCom/tinymce,tinymce/tinymce,aduth/tinymce,FernCreek/tinymce,MediehusetTek/tinymce,jtark/tinymce,adaptiffdesigns/tinymce,blakewallan/tinymce,leofeyer/tinymce,gencer/tinymce,TeamupCom/tinymce,danielpunkass/tinymce,gencer/tinymce,ETSI-CTI/TinySpecMCE,FernCreek/tinymce,fillabs/TinySpecMCE,FernCreek/tinymce,tinymce/tinymce