### 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)

ClassDB::bind_method(D_METHOD("is_clear_button_enabled"), &LineEdit::is_clear_button_enabled);
	ClassDB::bind_method(D_METHOD("set_shortcut_keys_enabled", "enable"), &LineEdit::set_shortcut_keys_enabled);
	ClassDB::bind_method(D_METHOD("is_shortcut_keys_enabled"), &LineEdit::is_shortcut_keys_enabled);
	ClassDB::bind_method(D_METHOD("set_middle_mouse_paste_enabled", "enable"), &LineEdit::set_middle_mouse_paste_enabled);
	ClassDB::bind_method(D_METHOD("is_middle_mouse_paste_enabled"), &LineEdit::is_middle_mouse_paste_enabled);
	ClassDB::bind_method(D_METHOD("set_selecting_enabled", "enable"), &LineEdit::set_selecting_enabled);
	ClassDB::bind_method(D_METHOD("is_selecting_enabled"), &LineEdit::is_selecting_enabled);
	ClassDB::bind_method(D_METHOD("set_deselect_on_focus_loss_enabled", "enable"), &LineEdit::set_deselect_on_focus_loss_enabled);
	ClassDB::bind_method(D_METHOD("is_deselect_on_focus_loss_enabled"), &LineEdit::is_deselect_on_focus_loss_enabled);
	ClassDB::bind_method(D_METHOD("set_right_icon", "icon"), &LineEdit::set_right_icon);
	ClassDB::bind_method(D_METHOD("get_right_icon"), &LineEdit::get_right_icon);
	ClassDB::bind_method(D_METHOD("set_flat", "enabled"), &LineEdit::set_flat);
	ClassDB::bind_method(D_METHOD("is_flat"), &LineEdit::is_flat);
	ClassDB::bind_method(D_METHOD("set_select_all_on_focus", "enabled"), &LineEdit::set_select_all_on_focus);
	ClassDB::bind_method(D_METHOD("is_select_all_on_focus"), &LineEdit::is_select_all_on_focus);
	ADD_SIGNAL(MethodInfo("text_changed", PropertyInfo(Variant::STRING, "new_text")));
	ADD_SIGNAL(MethodInfo("text_change_rejected", PropertyInfo(Variant::STRING, "rejected_substring")));
	ADD_SIGNAL(MethodInfo("text_submitted", PropertyInfo(Variant::STRING, "new_text")));
	BIND_ENUM_CONSTANT(MENU_CUT);
	BIND_ENUM_CONSTANT(MENU_COPY);
	BIND_ENUM_CONSTANT(MENU_PASTE);
	BIND_ENUM_CONSTANT(MENU_CLEAR);
	BIND_ENUM_CONSTANT(MENU_SELECT_ALL);
	BIND_ENUM_CONSTANT(MENU_UNDO);
	BIND_ENUM_CONSTANT(MENU_REDO);
	BIND_ENUM_CONSTANT(MENU_SUBMENU_TEXT_DIR);
	BIND_ENUM_CONSTANT(MENU_DIR_INHERITED);
	BIND_ENUM_CONSTANT(MENU_DIR_AUTO);
	BIND_ENUM_CONSTANT(MENU_DIR_LTR);
	BIND_ENUM_CONSTANT(MENU_DIR_RTL);