TINY-985: fixed isdefaultprevented if statement
TINY-985: fixed isdefaultprevented if statement

tinymce/tinymce,FernCreek/tinymce,tinymce/tinymce,gencer/tinymce,TeamupCom/tinymce,TeamupCom/tinymce,danielpunkass/tinymce,MediehusetTek/tinymce,adaptiffdesigns/tinymce,MediehusetTek/tinymce,gencer/tinymce,FernCreek/tinymce,leofeyer/tinymce,adaptiffdesigns/tinymce,leofeyer/tinymce,danielpunkass/tinymce,danielpunkass/tinymce,tinymce/tinymce,FernCreek/tinymce