macosx: disable macosx-black by default

...because this option behaves awful in Mavericks.

modules/gui/macosx/macosx.m

@@ -177,6 +177,6 @@ vlc_module_begin()
         set_section(N_("Video output"), 0)
         add_integer("macosx-vdev", 0, VDEV_TEXT, VDEV_LONGTEXT, false)
         add_float_with_range("macosx-opaqueness", 1, 0, 1, OPAQUENESS_TEXT, OPAQUENESS_LONGTEXT, true);
-        add_bool("macosx-black", true, BLACK_TEXT, BLACK_LONGTEXT, false)
+        add_bool("macosx-black", false, BLACK_TEXT, BLACK_LONGTEXT, false)
 vlc_module_end()