[ModLog] Prevent duplicate kwarg error

[Tobotimus]

The name key used to be set in the Config for casetypes.

Resolves this traceback:

Traceback (most recent call last):
  File "discord/ext/commands/core.py", line 79, in wrapped
    ret = await coro(*args, **kwargs)
  File "redbot/cogs/mod/kickban.py", line 223, in ban
    user=user, ctx=ctx, days=days, reason=reason, create_modlog_case=True
  File "redbot/cogs/mod/kickban.py", line 114, in ban_user
    channel=None,
  File "redbot/core/modlog.py", line 647, in create_case
    case_type = await get_casetype(action_type, guild)
  File "redbot/core/modlog.py", line 699, in get_casetype
    casetype = CaseType.from_json(name, data)
  File "redbot/core/modlog.py", line 466, in from_json
    return cls(name=name, **data, **kwargs)
TypeError: type object got multiple values for keyword argument 'name'

[Flame442]

I made a case (by hackbanning a random person), ran [p]modlogset resetcases, then tried to do [p]case 1. Rather than saying "That case does not exist for that server", it errored with the following error:

Exception in command 'case'
Traceback (most recent call last):
  File "c:\users\flame\desktop\random\testingredbot\reddev\venv\lib\site-packages\discord\ext\commands\core.py", line 79, in wrapped
    ret = await coro(*args, **kwargs)
  File "c:\users\flame\desktop\random\testingredbot\reddev\venv\lib\site-packages\redbot\cogs\modlog\modlog.py", line 106, in case
    await ctx.send(embed=await case.message_content(embed=True))
  File "c:\users\flame\desktop\random\testingredbot\reddev\venv\lib\site-packages\redbot\core\modlog.py", line 207, in message_content
    filter_invites(f"{self.user} ({self.user.id})")
AttributeError: 'NoneType' object has no attribute 'id'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "c:\users\flame\desktop\random\testingredbot\reddev\venv\lib\site-packages\discord\ext\commands\bot.py", line 863, in invoke
    await ctx.command.invoke(ctx)
  File "c:\users\flame\desktop\random\testingredbot\reddev\venv\lib\site-packages\discord\ext\commands\core.py", line 728, in invoke
    await injected(*ctx.args, **ctx.kwargs)
  File "c:\users\flame\desktop\random\testingredbot\reddev\venv\lib\site-packages\discord\ext\commands\core.py", line 88, in wrapped
    raise CommandInvokeError(exc) from exc
discord.ext.commands.errors.CommandInvokeError: Command raised an exception: AttributeError: 'NoneType' object has no attribute 'id'

This error does not appear following the same steps on my current 3.1.2 bot. All case numbers error after clearing cases (so [p]case 222 also throws an error), but when a new case is created that number works as normal.

[Tobotimus]

@Flame442 I believe that should be a separate issue, it's unrelated to this PR. Was likely caused by the ModLog config redesign PR.