Refactor SQL functions: clean up syntax and remove unused function

Author: Vianpyro

database/functions/disable_2fa.sql

@@ -6,6 +6,6 @@ BEGIN
     RETURN QUERY
     SELECT discriminator
     FROM users
-    WHERE users.username = p_username;
+    WHERE username = p_username;
 END;
 $$ LANGUAGE plpgsql;

database/functions/get_used_discriminators.sql

@@ -1,5 +1,11 @@
 -- Get the user's authentication methods secret
-CREATE OR REPLACE FUNCTION get_user_authentication_method_secret(p_user_id UUID) RETURNS TABLE (method TEXT, secret TEXT) AS $$
+CREATE OR REPLACE FUNCTION get_user_authentication_method_secret(
+    p_user_id UUID
+)
+RETURNS TABLE (
+    method TEXT,
+    secret TEXT
+) AS $$
 BEGIN
     RETURN QUERY
     SELECT authentication_method, user_authentication_method_secret