fix: incorrect error name for 1017 (#2331)

Fixed a copy and paste mistake

***NO_CI***

server/helpers/error.js

@@ -229,7 +229,7 @@ module.exports = {
     message: 'An unexpected error occured during user creation.',
     code: 1009
   }),
-  UserDeleteForeignConstraint: CustomError('UserCreationFailed', {
+  UserDeleteForeignConstraint: CustomError('UserDeleteForeignConstraint', {
     message: 'Cannot delete user because of content relational constraints.',
     code: 1017
   }),