### Godot version

4.0.2.stable.official [7a0977ce2]

### System information

Windows 10

### Issue description

LineEdit node with enabled "expand_to_text_length" option and "minimum_character_width = 0" and cleared margins in style overrides still has some empty space inside
![node](https://github.com/godotengine/godot/assets/23380802/86c79678-8422-4a98-8406-602edd7dc48b)
![node settings](https://github.com/godotengine/godot/assets/23380802/11d04d71-bbf1-4c16-8155-fe39b5bbd66b)
![style overrides](https://github.com/godotengine/godot/assets/23380802/6b3c3925-b4bd-455b-aac1-ddeb54a4d796)


### Steps to reproduce

1. Add LineEdit node
2. Set expand_to_text_length = true
3. Set minimum_character_width in theme overrides = 0
4. Set normal to StyleBoxEmpty


### Minimal reproduction project

[LineEdit can't be zero sized.zip](https://github.com/godotengine/godot/files/11566017/LineEdit.can.t.be.zero.sized.zip)

}
		if (b->is_pressed() && b->get_button_index() == MouseButton::RIGHT && context_menu_enabled) {
			_update_context_menu();
			menu->set_position(get_screen_position() + get_local_mouse_position());
			menu->reset_size();
			menu->popup();
			grab_focus();
			accept_event();
			return;
		}
		if (is_middle_mouse_paste_enabled() && b->is_pressed() && b->get_button_index() == MouseButton::MIDDLE && is_editable() && DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_CLIPBOARD_PRIMARY)) {
			String paste_buffer = DisplayServer::get_singleton()->clipboard_get_primary().strip_escapes();
			deselect();
			set_caret_at_pixel_pos(b->get_position().x);
			if (!paste_buffer.is_empty()) {
				insert_text_at_caret(paste_buffer);
				if (!text_changed_dirty) {
					if (is_inside_tree()) {
						MessageQueue::get_singleton()->push_call(this, "_text_changed");
					}
					text_changed_dirty = true;
				}
			}
			grab_focus();
			accept_event();
			return;
		}
		if (b->get_button_index() != MouseButton::LEFT) {
			return;
		}