GtkEntryCompletion: Treat ::text-column specially
GtkEntryCompletion: Treat ::text-column specially

Using the setting for this property conflicts with the documentation
for gtk_entry_completion_set_text_column() which explicitly states
that setting the property directly behaves differently. Concretely,
this caused the file chooser entry completion popup to have two
columns (with identical content).

This partially reverts 331c28b369edae9aa3df2a24833ccb02ef8d7152.

jessevdk/gtk,grubersjoe/adwaita,Adamovskiy/gtk,Lyude/gtk-,alexlarsson/gtk,jessevdk/gtk,Lyude/gtk-,davidgumberg/gtk,jigpu/gtk,davidgumberg/gtk,alexlarsson/gtk,davidgumberg/gtk,jessevdk/gtk,jadahl/gtk,ahodesuka/gtk,alexlarsson/gtk,Adamovskiy/gtk,ahodesuka/gtk,chergert/gtk,jessevdk/gtk,Adamovskiy/gtk,jadahl/gtk,Lyude/gtk-,Lyude/gtk-,ahodesuka/gtk,alexlarsson/gtk,Adamovskiy/gtk,chergert/gtk,davidgumberg/gtk,alexlarsson/gtk,jessevdk/gtk,jessevdk/gtk,chergert/gtk,grubersjoe/adwaita,Adamovskiy/gtk,jigpu/gtk,Adamovskiy/gtk,jadahl/gtk,jigpu/gtk,grubersjoe/adwaita,davidgumberg/gtk,Lyude/gtk-,jadahl/gtk,Lyude/gtk-,jigpu/gtk,jigpu/gtk,ahodesuka/gtk,davidgumberg/gtk,jadahl/gtk,alexlarsson/gtk,chergert/gtk,jadahl/gtk,alexlarsson/gtk,chergert/gtk,chergert/gtk,jigpu/gtk,alexlarsson/gtk,chergert/gtk,davidgumberg/gtk,Lyude/gtk-,grubersjoe/adwaita,jigpu/gtk,Adamovskiy/gtk,Lyude/gtk-,grubersjoe/adwaita,ahodesuka/gtk,ahodesuka/gtk,ahodesuka/gtk,chergert/gtk,Adamovskiy/gtk,jigpu/gtk,jessevdk/gtk,grubersjoe/adwaita,grubersjoe/adwaita,ahodesuka/gtk,jadahl/gtk,davidgumberg/gtk,jadahl/gtk,grubersjoe/adwaita