gtkplacesview: don't warn for cancelled operations
gtkplacesview: don't warn for cancelled operations

This was intended to filter out cancelled operations, not
the other way around.

https://bugzilla.gnome.org/show_bug.cgi?id=754150

alexlarsson/gtk,chergert/gtk,jadahl/gtk,davidgumberg/gtk,jigpu/gtk,grubersjoe/adwaita,jadahl/gtk,jigpu/gtk,alexlarsson/gtk,chergert/gtk,jigpu/gtk,chergert/gtk,jadahl/gtk,davidgumberg/gtk,jadahl/gtk,jigpu/gtk,chergert/gtk,alexlarsson/gtk,chergert/gtk,grubersjoe/adwaita,davidgumberg/gtk,chergert/gtk,alexlarsson/gtk,alexlarsson/gtk,chergert/gtk,grubersjoe/adwaita,jadahl/gtk,davidgumberg/gtk,davidgumberg/gtk,jigpu/gtk,jadahl/gtk,davidgumberg/gtk,davidgumberg/gtk,jigpu/gtk,jigpu/gtk,chergert/gtk,grubersjoe/adwaita,jadahl/gtk,jadahl/gtk,grubersjoe/adwaita,davidgumberg/gtk,grubersjoe/adwaita,jigpu/gtk,alexlarsson/gtk,alexlarsson/gtk,grubersjoe/adwaita,alexlarsson/gtk,grubersjoe/adwaita