Setting `delete_existing=False` in `sync_commands` causes an error.

[Icebluewolf]

Minimal Reproducible Code
Precondition: Your bot has 1 or more commands registered already.

import discord
import os

bot = discord.Bot()

@bot.event
async def on_ready():
    print(f"Logged in as {bot.user}")
    await bot.sync_commands(delete_existing=False)

bot.auto_sync_commands = False
bot.run(os.environ['DISCORD_TOKEN'])

Result

Ignoring exception in on_ready
Traceback (most recent call last):
  File "...\discord\client.py", line 465, in _run_event
    await coro(*args, **kwargs)
  File "...\PycordTesting\stand_alone_main.py", line 206, in on_ready
    await bot.sync_commands(delete_existing=False)
  File "...\discord\bot.py", line 766, in sync_commands
    registered_commands = await self.register_commands(
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "...\discord\bot.py", line 619, in register_commands
    data = [cmd["command"].to_dict() for cmd in filtered_deleted]
            ^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'Command' object has no attribute 'to_dict'

This error is pretty self explanatory and will likely be resolved by creating a simple wrapper class for the deleted commands instead of the namedtuple.