### 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 (context_menu_enabled) {
			if (k->is_action("ui_menu", true)) {
				_update_context_menu();
				Point2 pos = Point2(get_caret_pixel_pos().x, (get_size().y + theme_cache.font->get_height(theme_cache.font_size)) / 2);
				menu->set_position(get_screen_position() + pos);
				menu->reset_size();
				menu->popup();
				menu->grab_focus();
				accept_event();
				return;
			}
		}
		
		if (k->is_action("ui_text_submit", false)) {
			emit_signal(SNAME("text_submitted"), text);
			if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_VIRTUAL_KEYBOARD) && virtual_keyboard_enabled) {
				DisplayServer::get_singleton()->virtual_keyboard_hide();
			}
			accept_event();
			return;
		}
		if (is_shortcut_keys_enabled()) {
			if (k->is_action("ui_copy", true)) {
				copy_text();
				accept_event();
				return;
			}
			if (k->is_action("ui_text_select_all", true)) {