Change database structure. UsernameLength belong in CategoryGroup.

MySQL_docker/highscores_database.sql

@@ -4,7 +4,6 @@ use highscores;
 CREATE TABLE Guilds(
    GuildId bigint unsigned not null unique,
    SubmissionChannel bigint unsigned,
-   UsernameLength smallint DEFAULT 12,
    VerificationChannel bigint unsigned,
    PRIMARY KEY (GuildId)
 );
@@ -16,6 +15,7 @@ CREATE TABLE CategoryGroups(
    GuildId bigint unsigned not null,
    MessageId bigint unsigned,
    PadLength smallint not null DEFAULT 26,
+   UsernameLength smallint DEFAULT 12,
    CONSTRAINT UniqueGuildCategoryGroup UNIQUE (GuildId, GroupName),
    FOREIGN KEY (GuildId) REFERENCES Guilds(GuildId),
    PRIMARY KEY (GroupId)