### 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
area.set_end((area.get_end() + Vector2i(1, 1)).min(tile_set_atlas_source->get_atlas_grid_size()));
		Vector2i margins = tile_set_atlas_source->get_margins();
		Vector2i separation = tile_set_atlas_source->get_separation();
		Vector2i tile_size = tile_set_atlas_source->get_texture_region_size();
		Vector2i origin = margins + (area.position * (tile_size + separation));
		TilesEditorUtils::draw_selection_rect(tile_atlas_control, Rect2i(origin, area.size * tile_size));
	} else {
		Vector2i grid_size = tile_set_atlas_source->get_atlas_grid_size();
		if (hovered_base_tile_coords.x >= 0 && hovered_base_tile_coords.y >= 0 && hovered_base_tile_coords.x < grid_size.x && hovered_base_tile_coords.y < grid_size.y) {
			Vector2i hovered_tile = tile_set_atlas_source->get_tile_at_coords(hovered_base_tile_coords);
			if (hovered_tile != TileSetSource::INVALID_ATLAS_COORDS) {
				
				for (int frame = 0; frame < tile_set_atlas_source->get_tile_animation_frames_count(hovered_tile); frame++) {
					Color color = Color(1.0, 0.8, 0.0, frame == 0 ? 0.6 : 0.3);
					TilesEditorUtils::draw_selection_rect(tile_atlas_control, tile_set_atlas_source->get_tile_texture_region(hovered_tile, frame), color);
				}
			} else {
				
				if (tools_button_group->get_pressed_button() == tool_setup_atlas_source_button) {
					Vector2i margins = tile_set_atlas_source->get_margins();
					Vector2i separation = tile_set_atlas_source->get_separation();
					Vector2i tile_size = tile_set_atlas_source->get_texture_region_size();
					Vector2i origin = margins + (hovered_base_tile_coords * (tile_size + separation));
					TilesEditorUtils::draw_selection_rect(tile_atlas_control, Rect2i(origin, tile_size));
				}
			}
		}
	}
}
void TileSetAtlasSourceEditor::_tile_atlas_control_unscaled_draw() {