xsettings: Remove warning -Wcast-function-type

[rbuj]

msd-xsettings-manager.c: In function ‘scale_change_workarounds’:
msd-xsettings-manager.c:577:51: warning: cast between incompatible function types from ‘gboolean (*)(gboolean)’ {aka ‘int (*)(int)’} to ‘gboolean (*)(void *)’ {aka ‘int (*)(void *)’} [-Wcast-function-type]
  577 |                         g_timeout_add_seconds (1, (GSourceFunc) delayed_toggle_bg_draw, (gpointer) FALSE);
      |                                                   ^
msd-xsettings-manager.c:578:51: warning: cast between incompatible function types from ‘gboolean (*)(gboolean)’ {aka ‘int (*)(int)’} to ‘gboolean (*)(void *)’ {aka ‘int (*)(void *)’} [-Wcast-function-type]
  578 |                         g_timeout_add_seconds (2, (GSourceFunc) delayed_toggle_bg_draw, (gpointer) TRUE);
      |                                                   ^

[lukefromdc]

How do we test this?

[rbuj]

You can change the scale:

gsettings set org.mate.interface window-scaling-factor 2

and query the value:

gsettings get org.mate.background show-desktop-icons