fix channel bitrate calculation

[Commandserver]

the issue was when creating a voice channel with a bitrate of 96,

dpp::channel channel;
		channel.set_name("test-voice-channel");
		channel.set_guild_id(GUILD_ID);
		channel.set_type(dpp::channel_type::CHANNEL_VOICE);
		channel.set_bitrate(96);
		channel.set_user_limit(2);
		bot.channel_create(channel);

i got this error:

ERROR: Error 50035 [Invalid Form Body] on API request, returned content was: {"code": 50035, "errors": {"bitrate": {"_errors": [{"code": "NUMBER_TYPE_MAX", "message": "int value should be less than or equal to 96000."}]}}, "message": "Invalid Form Body"}

The bitrate attribute will now be multiplied by 1000 instead of 1024.

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