### 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 (ED_IS_SHORTCUT("tiles_editor/delete_tile", p_event)) {
		if (tools_button_group->get_pressed_button() == tool_select_button && !selection.is_empty()) {
			_menu_option(TILE_DELETE);
			accept_event();
		}
	}
}
void TileSetAtlasSourceEditor::_set_selection_from_array(Array p_selection) {
	ERR_FAIL_COND((p_selection.size() % 2) != 0);
	selection.clear();
	for (int i = 0; i < p_selection.size() / 2; i++) {
		TileSelection selected = { p_selection[i * 2], p_selection[i * 2 + 1] };
		if (tile_set_atlas_source->has_tile(selected.tile) && tile_set_atlas_source->has_alternative_tile(selected.tile, selected.alternative)) {
			selection.insert(selected);
		}
	}
	_update_tile_inspector();
	_update_tile_id_label();
	_update_atlas_view();
	_update_current_tile_data_editor();
}
Array TileSetAtlasSourceEditor::_get_selection_as_array() {