Fix a crash in the plasmoid due to GluonGraphics::Engine not being initialized.
Fix a crash in the plasmoid due to GluonGraphics::Engine not being initialized.

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