Fixes leak:
==5763== 96 (32 direct, 64 indirect) bytes in 1 blocks are definitely lost in loss record 10,901 of 13,065
==5763== at 0x4F81D57: g_type_create_instance (gtype.c:1929)
==5763== by 0x4F64ABF: g_object_new_internal.part.0 (gobject.c:2606)
==5763== by 0x4F66ADD: g_object_new_internal (gobject.c:2603)
==5763== by 0x4F66ADD: g_object_new_with_properties (gobject.c:2769)
==5763== by 0x4F67A30: g_object_new (gobject.c:2415)
==5763== by 0x52F7C46: clutter_color_state_new_full (clutter-color-state.c:339)
==5763== by 0x52F7C03: clutter_color_state_new (clutter-color-state.c:312)
==5763== by 0x52F7110: clutter_color_manager_get_default_color_state (clutter-color-manager.c:150)
==5763== by 0x52E7543: get_default_color_state (clutter-actor.c:17836)
==5763== by 0x52E765D: clutter_actor_unset_color_state (clutter-actor.c:17864)
==5763== by 0x52CF056: clutter_actor_constructor (clutter-actor.c:5646)
==5763== by 0x4F64DD3: g_object_new_with_custom_constructor (gobject.c:2524)
==5763== by 0x4F67275: g_object_new_internal (gobject.c:2604)
==5763== by 0x4F67275: g_object_new_valist (gobject.c:2945)
Fixes: 2693cac83a5c ("clutter/color-manager: Add a method to get the default color state")
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4149>
57f3e172ca