Editor ignores 'run/window_placement/screen' setting when 'prefer_wayland' is enabled

### Tested versions

Reproducible in 4.3 dev 3

### System information

Godot v4.3.dev3 - Arch Linux #1 SMP PREEMPT_DYNAMIC Mon, 05 Feb 2024 22:07:49 +0000 - Wayland - GLES3 (Compatibility) - AMD Radeon RX 6600 (radeonsi, navi23, LLVM 16.0.6, DRM 3.57, 6.7.4-arch1-1) () - AMD Ryzen 7 5700G with Radeon Graphics (16 Threads)

### Issue description

Godot always runs the project on screen 1 instead of screen 2 regardless of window placement setting. If the editor is on screen 2, the project still always launches on screen 1.

### Steps to reproduce

- Create new project
- Create empty node as scene root
- Change window placement setting to 'next screen' or 'screen 2'
- Run project

### Minimal reproduction project (MRP)

N/A

Start by reproducing this with Godot v4.3.dev3 on Wayland, with prefer_wayland enabled and the window placement set to “next screen” or “screen 2.” Trace the editor's project-launch window placement behavior; it is done when the project launches on the configured screen instead of always screen 1.

Written by the indexing model from the issue text.