[gail] Clean the code to check the redundan object on the show watcher
[gail] Clean the code to check the redundan object on the show watcher

The watcher doesn't add a window if is a redundant object. This
patch fixes two things:

 * The check was made twice.
 * It uses a check with the string "redundant object", when the
   defined role ATK_ROLE_REDUNDANT_OBJECT is available

jigpu/gtk,bratsche/gtk-,chergert/gtk,alexlarsson/gtk,Lyude/gtk-,chergert/gtk,Adamovskiy/gtk,davidt/gtk,davidgumberg/gtk,jessevdk/gtk,Lyude/gtk-,Sidnioulz/SandboxGtk,davidgumberg/gtk,davidt/gtk,jessevdk/gtk,msteinert/gtk,ebassi/gtk,davidgumberg/gtk,davidgumberg/gtk,msteinert/gtk,Distrotech/gtk2,Sidnioulz/SandboxGtk,grubersjoe/adwaita,Lyude/gtk-,chergert/gtk,jigpu/gtk,simokivimaki/gtk,bratsche/gtk-,Lyude/gtk-,ahodesuka/gtk,grubersjoe/adwaita,msteinert/gtk,simokivimaki/gtk,ahodesuka/gtk,Sidnioulz/SandboxGtk,grubersjoe/adwaita,davidt/gtk,grubersjoe/adwaita,davidgumberg/gtk,jadahl/gtk,simokivimaki/gtk,ebassi/gtk,msteinert/gtk,chergert/gtk,grubersjoe/adwaita,Lyude/gtk-,davidt/gtk,alexlarsson/gtk,Adamovskiy/gtk,alexlarsson/gtk,chergert/gtk,Adamovskiy/gtk,Sidnioulz/SandboxGtk,alexlarsson/gtk,ahodesuka/gtk,jadahl/gtk,ahodesuka/gtk,alexlarsson/gtk,Lyude/gtk-,Lyude/gtk-,ahodesuka/gtk,davidgumberg/gtk,jadahl/gtk,jigpu/gtk,alexlarsson/gtk,jessevdk/gtk,davidgumberg/gtk,ebassi/gtk,grubersjoe/adwaita,Adamovskiy/gtk,jigpu/gtk,chergert/gtk,jessevdk/gtk,grubersjoe/adwaita,Adamovskiy/gtk,Lyude/gtk-,davidgumberg/gtk,jessevdk/gtk,Distrotech/gtk2,Adamovskiy/gtk,davidt/gtk,Distrotech/gtk2,jessevdk/gtk,bratsche/gtk-,Adamovskiy/gtk,msteinert/gtk,jadahl/gtk,ebassi/gtk,simokivimaki/gtk,ebassi/gtk,Sidnioulz/SandboxGtk,Distrotech/gtk2,jigpu/gtk,chergert/gtk,simokivimaki/gtk,simokivimaki/gtk,jessevdk/gtk,alexlarsson/gtk,jigpu/gtk,jigpu/gtk,jigpu/gtk,Adamovskiy/gtk,davidt/gtk,bratsche/gtk-,jadahl/gtk,ebassi/gtk,bratsche/gtk-,Distrotech/gtk2,Sidnioulz/SandboxGtk,ahodesuka/gtk,msteinert/gtk,chergert/gtk,ahodesuka/gtk,jadahl/gtk,grubersjoe/adwaita,ahodesuka/gtk,jadahl/gtk,alexlarsson/gtk,Distrotech/gtk2,jadahl/gtk,bratsche/gtk-