GtkMenuShell: We want separators in submenus
GtkMenuShell: We want separators in submenus

This was probably an oversight when adding the merge_separators
parameter. Without this change, the testsuite/gtk/gtkmenu test
fails.

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