themes: fix check/radio buttons in tree views
Apply the check/radio-button style to GtkTreeView, so that GtkCellRendererToggle picks the right check/radio-button graphic. Otherwise, it falls back to a graphic that depends on the system theme, and which may not play well with the current theme colors. Note that this only affects the Dark theme; in the Light and Gray themes, one of the KDE-hack styles "takes care" of this, but this commit applies the same change to these themes anyway.
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