Remove descriptive buttons entry now we are using dialogs_show_question_full

git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@739 ea778897-0a13-0410-b9d1-a72fbfd435f5

TODO

@@ -11,7 +11,6 @@ TODO List:
 	o inverting highlighting by selection
 	o src/sci_cb.c: improve auto completion(include local tags)
 	o user-definable auto completion structs
-	o dialogs to use descriptive buttons and 12px border
 	o documentation: preferences
 	o save build includes & arguments
 	o separate filetype for HTML