`prefix` isn't honored in some places

[evgfilim1]

• When looking for .help command:

  userbot/userbot/modules/commands.py

  Lines 388 to 403 in 2d862d1

  	if args := command.args:
  	for h in self._handlers:
  	for cmd in h.commands:
  	match cmd:
  	case re.Pattern() as pattern:
  	matches = pattern.fullmatch(args) is not None
  	case str():
  	matches = cmd == args
  	case _:
  	raise AssertionError(f"Unexpected command type: {type(cmd)}")
  	if matches:
  	usage = h.format_usage(full=True)
  	return _("<b>Help for {args}:</b>\n{usage}").format(
  	args=html.escape(args),
  	usage=html.escape(usage),
  	)

• When checking command conflicts while registering:

  userbot/userbot/modules/commands.py

  Lines 423 to 426 in 2d862d1

  	for handler in self._handlers:
  	for cmd in handler.commands:
  	if cmd in commands:
  	raise ValueError(f"Duplicate command: {cmd}")