Fix twitch_rank column not being included in SQL schema

[Absolucy]

About The Pull Request

This adds the twitch_rank column to the /tg/ schema

The actual official server has several SQL columns/tables that weren't properly added to the repo, this is just one column.

The other tables that aren't in the schema are the following:

• metric_data
• subsystem_metrics
• subsystem_extra_metrics
• overwatch_whitelist
• overwatch_asn_ban

However, I'd prefer @dwasint add the actual schema (which he prolly knows or can just get from the server), rather than me guessing the schema from the DM code.

Migration (not needed for official server, obviously):

ALTER TABLE `player`
	ADD COLUMN `twitch_rank` VARCHAR(32) NOT NULL DEFAULT '' AFTER `metacoins`;

Changelog

no player-facing or even server changes at all