Fix syncing Xwayland::Scale config option
The new scale value is written but it's not flushed to the disk so when kcm_fonts_init and kcm_style_init run, they use the old scale value.
(cherry picked from commit 63c1363c)
The new scale value is written but it's not flushed to the disk so when kcm_fonts_init and kcm_style_init run, they use the old scale value.
(cherry picked from commit 63c1363c)