Tiny mouse pointer under wayland

### Tested versions

Godot v4.3.stable

### System information

Godot v4.3.stable - Manjaro Linux #1 SMP PREEMPT_DYNAMIC Mon Aug 19 09:51:26 UTC 2024 - Wayland - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3060 (nvidia; 550.107.02) - 12th Gen Intel(R) Core(TM) i5-12400F (12 Threads)

### Issue description

[Screencast_20240902_080033.webm](https://github.com/user-attachments/assets/006f0853-1956-44bc-b082-e6356b43b242)

As seen in the video, the mouse is tiny compared with the OS one (the size changes when hovering the system titlebar)

### Steps to reproduce

Just start godot with wayland support (--display-driver wayland) under linux

### Minimal reproduction project (MRP)

Not applicable

Start by reproducing Godot v4.3 with --display-driver wayland under Linux and compare the pointer size with the system titlebar pointer. Trace the Wayland display and cursor handling used by the editor, then verify that the pointer size remains consistent across the Godot window and titlebar.

Written by the indexing model from the issue text.