qt: fix QtQuick version
Connections.enabled requires QtQuick 2.7:
qml: component is not ready: qrc:/player/Player.qml:121 Type PlayerPlaylistVisiblityFSM unavailable
qrc:/player/PlayerPlaylistVisiblityFSM.qml:99 "Connections.enabled" is not available in QtQuick 2.0.
For consistency with other Qml headers, use QtQuick 2.11.
Edited by Romain Vimont