### 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
selection.clear();
	
	tile_set = p_tile_set;
	tile_set_atlas_source = p_tile_set_atlas_source;
	tile_set_atlas_source_id = p_source_id;
	
	read_only = new_read_only_state;
	if (tile_set.is_valid()) {
		tile_set->connect_changed(callable_mp(this, &TileSetAtlasSourceEditor::_tile_set_changed));
	}
	if (read_only && tools_button_group->get_pressed_button() == tool_paint_button) {
		tool_paint_button->set_pressed(false);
		tool_setup_atlas_source_button->set_pressed(true);
	}
	
	tool_paint_button->set_disabled(read_only);
	tools_settings_erase_button->set_disabled(read_only);
	tool_advanced_menu_button->set_disabled(read_only);
	
	_update_source_inspector();
	
	_update_fix_selected_and_hovered_tiles();
	_update_tile_id_label();
	_update_atlas_view();
	_update_atlas_source_inspector();
	_update_tile_inspector();
	_update_tile_data_editors();
	_update_current_tile_data_editor();
}
void TileSetAtlasSourceEditor::init_source() {