window: remove duplicate widget_resize_handler_t

Fixes the following build failure:

In file included from window.c:58:0:
window.h:194:16: error: redefinition of typedef 'widget_resize_handler_t'
window.h:178:16: note: previous declaration of 'widget_resize_handler_t' was here

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>

clients/window.h

@@ -191,9 +191,6 @@ typedef int (*widget_motion_handler_t)(struct widget *widget,
 typedef void (*widget_button_handler_t)(struct widget *widget,
 					struct input *input, uint32_t time,
 					int button, int state, void *data);
-typedef void (*widget_resize_handler_t)(struct widget *widget,
-					int32_t width, int32_t height,
-					void *data);
 
 struct window *
 window_create(struct display *display, int32_t width, int32_t height);