cell renderer progress: Avoid warnings
cell renderer progress: Avoid warnings

Use the right state when calling gtk_style_context_get_padding,
to avoid warnings.

grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita