Fix default CC thumbnail preview
Fix default CC thumbnail preview

kaltura/mwEmbed,slash851/mwEmbed,omridevk/mwEmbed,bordar/mwEmbed,panda-os/mwEmbed,slash851/mwEmbed,omridevk/mwEmbed,panda-os/mwEmbed,slash851/mwEmbed,kaltura/mwEmbed,alexmilk/mwEmbed,FlixMaster/mwEmbed,slash851/mwEmbed,FlixMaster/mwEmbed,bordar/mwEmbed,FlixMaster/mwEmbed,omridevk/mwEmbed,panda-os/mwEmbed,bordar/mwEmbed,panda-os/mwEmbed,kaltura/mwEmbed,alexmilk/mwEmbed,bordar/mwEmbed,alexmilk/mwEmbed,kaltura/mwEmbed,alexmilk/mwEmbed,omridevk/mwEmbed,FlixMaster/mwEmbed,tanyaLibatter/mwEmbed,tanyaLibatter/mwEmbed,tanyaLibatter/mwEmbed,tanyaLibatter/mwEmbed