Fix message highligh regression from last commit (#1490363)

Aleksander Machniak

2015-04-19 c095e6329c38bf759f42b414db9082d7f31aba18

1
tinymce.PluginManager.add("hr",function(a){a.addCommand("InsertHorizontalRule",function(){a.execCommand("mceInsertContent",!1,"<hr />")}),a.addButton("hr",{icon:"hr",tooltip:"Horizontal line",cmd:"InsertHorizontalRule"}),a.addMenuItem("hr",{icon:"hr",text:"Horizontal line",cmd:"InsertHorizontalRule",context:"insert"})});