Add category for announcement widget

vendor/built_in_modules/announcement/app/controllers/panel/announcement/widget/bulletins_controller.rb

@@ -13,7 +13,11 @@ class Panel::Announcement::Widget::BulletinsController < ObitWidgetController
 	# deadline
 	# @bulletin_categorys = BulletinCategory.first;
     # @bulletins = Bulletin.widget_datas(@bulletin_categorys.id).limit(9)
-    @bulletins = Bulletin.widget_datas.limit(9)
+    if params[:category_id]
+      @bulletins = Bulletin.where(:bulletin_category_id => params[:category_id]).widget_datas.limit(9)
+    else
+      @bulletins = Bulletin.widget_datas.limit(9)
+    end
 	
 	get_categorys