### 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
switch (p_what) {
		case NOTIFICATION_ENTER_TREE:
		case NOTIFICATION_THEME_CHANGED: {
			tool_setup_atlas_source_button->set_icon(get_theme_icon(SNAME("Tools"), SNAME("EditorIcons")));
			tool_select_button->set_icon(get_theme_icon(SNAME("ToolSelect"), SNAME("EditorIcons")));
			tool_paint_button->set_icon(get_theme_icon(SNAME("CanvasItem"), SNAME("EditorIcons")));
			tools_settings_erase_button->set_icon(get_theme_icon(SNAME("Eraser"), SNAME("EditorIcons")));
			tool_advanced_menu_button->set_icon(get_theme_icon(SNAME("GuiTabMenuHl"), SNAME("EditorIcons")));
			resize_handle = get_theme_icon(SNAME("EditorHandle"), SNAME("EditorIcons"));
			resize_handle_disabled = get_theme_icon(SNAME("EditorHandleDisabled"), SNAME("EditorIcons"));
		} break;
		case NOTIFICATION_INTERNAL_PROCESS: {
			if (tile_set_changed_needs_update) {
				
				read_only = false;
				
				if (tile_set.is_valid()) {