window: rename enum pointer_type to cursor_type

This avoids confusion with the pointer devices (struct wl_pointer).
diff --git a/clients/desktop-shell.c b/clients/desktop-shell.c
index 41d02d0..23a7f90 100644
--- a/clients/desktop-shell.c
+++ b/clients/desktop-shell.c
@@ -213,7 +213,7 @@
 
 	widget_set_tooltip(widget, basename((char *)launcher->path), x, y);
 
-	return POINTER_LEFT_PTR;
+	return CURSOR_LEFT_PTR;
 }
 
 static void
@@ -252,7 +252,7 @@
 	launcher->focused = 1;
 	widget_schedule_redraw(widget);
 
-	return POINTER_LEFT_PTR;
+	return CURSOR_LEFT_PTR;
 }
 
 static void
@@ -526,7 +526,7 @@
 	dialog->button_focused = 1;
 	widget_schedule_redraw(widget);
 
-	return POINTER_LEFT_PTR;
+	return CURSOR_LEFT_PTR;
 }
 
 static void