Remove deprecated Brazilian currencies in the setup process

[r-martins]

Preconditions

When installing Magento we have to choose a currency for your store.
There are some Brazilian currencies that are deprecated and that does not exist in Brazil for more than a decade and might be disabled/removed/hidden from the list.

Steps to reproduce

1. Start a new Magento 2.2.4-dev (branch 2.2-develop) setup on /setup
2. Agree to terms on step 1
3. Proceed to the installation until step 4 (Customize your store)
4. See the Store Default Currency with 6 deprecated Brazilian currencies

Expected result

1. See only Brazilian Real (BRL) option listed as Brazilian currencies.

Actual result

We see many unused, deprecated currencies for Brazil above the only valid option.

Other sources of information

In order to confirm that Brazilian Real is the only valid currency available in Brazil you can:

1. Google for it
2. Check on Brazilian Central Bank reference
3. Check on Wikipedia about Real
4. Check on Wikipedia that the other currencies are old and deprecated since 1994.

[r-martins]

I'm working on it #MLAU18

[magento-engcom-team]

@r-martins, thank you for your report.
We've acknowledged the issue and added to our backlog.