GtkDialog: fix up handling of style properties
The use of border-width-set here was an attempt to differentiate between explicitly set (from code / ui files) border width from theme changes. But when we are calling gtk_window_set_border_width to apply the theme value, the -set property gets set, and all further theme changes are ignored. This has the effect of only letting the default value of these properties get applied. Fix this by unsetting border-width-set after applying theme values.
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