Privacy Policy Fixes Part 2 (#5310)

## About The Pull Request

- Fixes the privacy policy still showing up after accepted.
- Makes it so closing out of the window kicks you.
- Converts the whole thing from preference based to SQL based.
## Why It's Good For The Game
Fixes and polish for a previously accepted PR are good for the game,
yes.
## Proof Of Testing
I can't take a screenshot of a privacy policy that didn't show up the
second time around after I accepted it, but it properly filled out the
database and worked during testing.

## Changelog
🆑
add: Closing out of the Privacy Policy window instead of accepting it
now kicks you.
fix: Fixed the Privacy Policy window showing up after you've already
accepted it once, for real this time.
/🆑

SQL/bubber_schema.sql

@@ -45,3 +45,12 @@ CREATE TABLE `stored_faxes` (
 COLLATE='utf8mb4_general_ci'
 ENGINE=InnoDB
 ;
+
+DROP TABLE IF EXISTS `privacy_policy_acceptances`;
+CREATE TABLE `privacy_policy_acceptances` (
+  `id` INT NOT NULL AUTO_INCREMENT,
+  `ckey` VARCHAR(32) NOT NULL,
+  `policy_key` VARCHAR(64) NOT NULL,
+  PRIMARY KEY (`id`),
+  UNIQUE INDEX `ckey_policy_unique` (`ckey`, `policy_key`)
+);