hmi-controller: Add missing removal of destroy listener

Shutting down the compositor gives us:

Invalid write of size 8
   at 0x4B1AEDB: wl_list_remove (wayland-util.c:56)
   by 0x4AF05BF: weston_signal_emit_mutable (signal.c:66)
   by 0x4ACBC2C: weston_compositor_destroy (compositor.c:8629)
   by 0x4864A4B: wet_main (main.c:3908)
   by 0x10915D: main (executable.c:33)
 Address 0x17435f20 is 224 bytes inside a block of size 384 free'd
   at 0x484617B: free (vg_replace_malloc.c:872)
   by 0x17718C7E: hmi_controller_destroy (hmi-controller.c:761)
   by 0x4AF059A: weston_signal_emit_mutable (signal.c:62)
   by 0x4ACBC2C: weston_compositor_destroy (compositor.c:8629)
   by 0x4864A4B: wet_main (main.c:3908)
   by 0x10915D: main (executable.c:33)

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
(cherry picked from commit cfbf2b0ab2ac7c50d8a1ea7645be3a9f3927825b)

ivi-shell/hmi-controller.c

@@ -738,6 +738,8 @@ hmi_controller_destroy(struct wl_listener *listener, void *data)
 	struct hmi_controller *hmi_ctrl =
 		container_of(listener, struct hmi_controller, destroy_listener);
 
+	wl_list_remove(&hmi_ctrl->destroy_listener.link);
+
 	wl_list_for_each_safe(link, next,
 			      &hmi_ctrl->workspace_fade.layer_list, link) {
 		wl_list_remove(&link->link);