tests/interactive: Fix compiler warning
tests/interactive: Fix compiler warning

Missing type for the closure argument.

Distrotech/clutter,GNOME/clutter,jigpu/clutter,jigpu/clutter,jigpu/clutter,Distrotech/clutter,jigpu/clutter,jigpu/clutter,jigpu/clutter,GNOME/clutter,Distrotech/clutter,GNOME/clutter,Distrotech/clutter,Distrotech/clutter,Distrotech/clutter,GNOME/clutter,GNOME/clutter