window: rename enum pointer_type to cursor_type

This avoids confusion with the pointer devices (struct wl_pointer).
diff --git a/clients/eventdemo.c b/clients/eventdemo.c
index 8e63540..4781546 100644
--- a/clients/eventdemo.c
+++ b/clients/eventdemo.c
@@ -247,9 +247,9 @@
 
 	if (x > e->x && x < e->x + e->w)
 		if (y > e->y && y < e->y + e->h)
-			return POINTER_HAND1;
+			return CURSOR_HAND1;
 
-	return POINTER_LEFT_PTR;
+	return CURSOR_LEFT_PTR;
 }
 
 /**