fix: fixed args#restResult including leading space

[BenSegal855]

This PR removes the leading space when using Args#rest() and Args#restResult() on arguments after the first one. This was achieved by removing the insertion of the paramater.leading value on the first reduction done by Array#reduce(), but keeping it for all others (if it isn't kept, the result would have no spaces kindalikethis). Test images and the code used to generate the images are below. I also added *.tgz to .gitingore as that was generated when I used yarn pack to test the changes.

Before

After

Test command file used

import { ApplyOptions } from '@sapphire/decorators';
import type { Args } from '@sapphire/framework';
import { send } from '@sapphire/plugin-editable-commands';
import { Subcommand } from '@sapphire/plugin-subcommands';
import type { Message } from 'discord.js';

@ApplyOptions<Subcommand.Options>({
  aliases: ['cws'],
  description: 'A basic command with some subcommands',
  subcommands: [
  	{
  		name: 'show',
  		messageRun: 'sShow'
  	},
  	{
  		name: 'group',
  		type: 'group',
  		entries: [
  			{ name: 'show', messageRun: 'gShow'}
  		]
  	}
  ]
})
export class UserCommand extends Subcommand {

  public async sShow(message: Message, args: Args) {
  	return send(message, `Normal subcommand args:\`\`\`${await args.rest('string')}\`\`\``);
  }

  public async gShow(message: Message, args: Args) {
  	return send(message, `Group subcommand args:\`\`\`${await args.rest('string')}\`\`\``);
  }
}

This PR closes #529