async deletePicture() {
        const success = await this.client.pupPage.evaluate((chatid) => {
            return window.WWebJS.deletePicture(chatid);
        }, this.id._serialized);

        return success;
    }
Deletes the group's picture.
@returns {Promise<boolean>} Returns true if the picture was properly deleted. This can return false if the user does not have the necessary permissions.