change Successfully created User tables tables to Successfully created User table

[ezkemboi]

Describe the bug
Remove one tables inside the src/scripts/createdb.js when the app created makes use of postgreSQL

export default User.sync().then(() => {
  console.log('Successfully created User tables tables')
}).catch(error => {
  console.log('The error: ', error)
})

To Reproduce
Steps to reproduce the behavior:

1. Generate a new app choosing the database as postgres & ORM as sequelize

Expected behavior

export default User.sync().then(() => {
  console.log('Successfully created User table')
}).catch(error => {
  console.log('The error: ', error)
})

Screenshots
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Desktop (please complete the following information):
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Additional context
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[ezkemboi]

It also needs to make a modification to allow more than one export. In an app, it can have many tables.

[Albert-Osei]

Seems this issue should be closed since the required change has already been implemented.