### Godot version

4.1.1 stable

### System information

Windows 10

### Issue description

this is the default size loaded on startup 1024 which seems fine but it actually have loaded the default [2048] and ignored the size in project settings
![image](https://github.com/godotengine/godot/assets/53877170/c8c71de7-468a-487f-8e6c-dba1ce0f8fa5)

changing it now to any size will break it 
[2048]
![image](https://github.com/godotengine/godot/assets/53877170/3082ff09-b7d7-41f7-8fbb-813074a54135)

[512]
![image](https://github.com/godotengine/godot/assets/53877170/5ea4620f-52b5-4d0e-a5f5-747e777cd59d)


### Steps to reproduce

change 2d shadow atlas size in project settings while using compatibility renderer. 

### Minimal reproduction project

_
CanvasLight canvas_light;
	return canvas_light_owner.make_rid(canvas_light);
}
void RasterizerCanvasGLES3::light_set_texture(RID p_rid, RID p_texture) {
	GLES3::TextureStorage *texture_storage = GLES3::TextureStorage::get_singleton();
	CanvasLight *cl = canvas_light_owner.get_or_null(p_rid);
	ERR_FAIL_COND(!cl);
	if (cl->texture == p_texture) {
		return;
	}
	ERR_FAIL_COND(p_texture.is_valid() && !texture_storage->owns_texture(p_texture));
	if (cl->texture.is_valid()) {
		texture_storage->texture_remove_from_texture_atlas(cl->texture);
	}
	cl->texture = p_texture;
	if (cl->texture.is_valid()) {
		texture_storage->texture_add_to_texture_atlas(cl->texture);
	}
}
void RasterizerCanvasGLES3::light_set_use_shadow(RID p_rid, bool p_enable) {