QML Player: Fix the GLWidget related leaking issue with smart pointer.
QML Player: Fix the GLWidget related leaking issue with smart pointer.

KDE/gluon,pranavrc/example-gluon,pranavrc/example-gluon,pranavrc/example-gluon,KDE/gluon,KDE/gluon,pranavrc/example-gluon,KDE/gluon