scalebutton: Update adjustment usage for sealing
scalebutton: Update adjustment usage for sealing

Also rename all variables named "adj" to "adjustment", like they're
called everywhere else.

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