refactor(database): remove duplicate "uuid" column from "users" table

database.xml

@@ -33,7 +33,6 @@
             <field type="VARCHAR(20) NULL">activation</field>
             <field type="VARCHAR(5) NULL">shortcuts</field>
             <field type="TEXT NULL">authenticator</field>
-            <field type="VARCHAR(50) NOT NULL">uuid</field>
             <field type="DATETIME NULL DEFAULT NULL">lastLoginAttempt</field>
             <field type="SMALLINT UNSIGNED NOT NULL DEFAULT '0'">failedLogins</field>