VideoPlayer: Tweak cover page look
VideoPlayer: Tweak cover page look

Use smaller font for video title and larger spacing between components.
Also restore usage of medium quality thumbnails when available.

RobertMe/sailfish-ytplayer,tworaz/sailfish-ytplayer,tworaz/sailfish-ytplayer,tworaz/sailfish-ytplayer,RobertMe/sailfish-ytplayer,RobertMe/sailfish-ytplayer,RobertMe/sailfish-ytplayer,RobertMe/sailfish-ytplayer,tworaz/sailfish-ytplayer,tworaz/sailfish-ytplayer