### 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
ClassDB::bind_method(D_METHOD("_set_selection_from_array"), &TileSetAtlasSourceEditor::_set_selection_from_array);
	ADD_SIGNAL(MethodInfo("source_id_changed", PropertyInfo(Variant::INT, "source_id")));
}
TileSetAtlasSourceEditor::TileSetAtlasSourceEditor() {
	set_shortcut_context(this);
	set_process_shortcut_input(true);
	set_process_internal(true);
	TileSetEditor::get_singleton()->register_split(this);
	
	VBoxContainer *middle_vbox_container = memnew(VBoxContainer);
	middle_vbox_container->set_custom_minimum_size(Size2(200, 0) * EDSCALE);
	add_child(middle_vbox_container);
	
	tools_button_group.instantiate();
	tools_button_group->connect("pressed", callable_mp(this, &TileSetAtlasSourceEditor::_update_fix_selected_and_hovered_tiles).unbind(1));
	tools_button_group->connect("pressed", callable_mp(this, &TileSetAtlasSourceEditor::_update_tile_id_label).unbind(1));
	tools_button_group->connect("pressed", callable_mp(this, &TileSetAtlasSourceEditor::_update_atlas_source_inspector).unbind(1));