### Godot version

v4.2.dev3.official [013e8e3af]

### System information

Windows 11, Core i5-12400F, RX 6600

### Issue description

TileSet->Setup->Separation maybe should have "px" like rest?
![Screenshot 2023-08-21 162202](https://github.com/godotengine/godot/assets/962340/3c6b9a97-7520-4610-8153-7882cc9c303f)
I know this is pixels from testing it.

TileSet->Select is this Animation Separation "px" too? idk
![Screenshot 2023-08-21 162131](https://github.com/godotengine/godot/assets/962340/fcb580e3-9ff7-41d8-92d3-e585841d3803)
I tried setting up animation separation and got a not enough room error, so maybe not "px". idk


Thanks.


### Steps to reproduce

- open TileSet->Setup->Separation, note some have "px" and one doesn't
- open TileSet->Select, is this separation "px" too?


### Minimal reproduction project

n/a
if (tile_set->get_source_count() == 0) {
		
		tile_set->disconnect_changed(callable_mp(this, &TileSetAtlasSourceEditor::_tile_set_changed));
		tile_set = Ref<TileSet>();
		return;
	}
	tile_set_changed_needs_update = true;
}
void TileSetAtlasSourceEditor::_tile_proxy_object_changed(String p_what) {
	tile_set_changed_needs_update = false; 
	_update_atlas_view();
}
void TileSetAtlasSourceEditor::_atlas_source_proxy_object_changed(String p_what) {
	if (p_what == "texture" && !atlas_source_proxy_object->get("texture").is_null()) {
		confirm_auto_create_tiles->popup_centered();
	} else if (p_what == "id") {
		emit_signal(SNAME("source_id_changed"), atlas_source_proxy_object->get_id());
	}
}
void TileSetAtlasSourceEditor::_undo_redo_inspector_callback(Object *p_undo_redo, Object *p_edited, String p_property, Variant p_new_value) {