### 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)

set_caret_column(caret_column_tmp);
				insert_text_at_caret(p_data);
			}
		} else if (selection.enabled && caret_column >= selection.begin && caret_column <= selection.end) {
			caret_column_tmp = selection.begin;
			selection_delete();
			set_caret_column(caret_column_tmp);
			insert_text_at_caret(p_data);
			grab_focus();
		} else {
			insert_text_at_caret(p_data);
			grab_focus();
		}
		select(caret_column_tmp, caret_column);
		if (!text_changed_dirty) {
			if (is_inside_tree()) {
				MessageQueue::get_singleton()->push_call(this, "_text_changed");
			}
			text_changed_dirty = true;
		}
		queue_redraw();
	}
}
Control::CursorShape LineEdit::get_cursor_shape(const Point2 &p_pos) const {
	if ((!text.is_empty() && is_editable() && _is_over_clear_button(p_pos)) || (!is_editable() && (!is_selecting_enabled() || text.is_empty()))) {
		return CURSOR_ARROW;
	}
	return Control::get_cursor_shape(p_pos);
}
bool LineEdit::_is_over_clear_button(const Point2 &p_pos) const {