Fix issue-218 - remove public redundancy

[lozinska]

Checklist

If you're unsure about a box, leave it unchecked. A maintainer will help you.

• I understand README.md. I also understand that acceptance of
  community PRs will be delayed until the test and CI systems are online.
• Identifiers in product code changes are properly _Ugly as per
  https://eel.is/c++draft/lex.name#3.1 or there are no product code changes.
• The STL builds successfully and all tests have passed (must be manually
  verified by an STL maintainer before CI is online, leave this unchecked for
  initial submission).
• These changes introduce no known ABI breaks (adding members, renaming
  members, adding virtual functions, changing whether a type is an aggregate
  or trivially copyable, etc.).
• These changes were written from scratch using only this repository and
  the C++ Working Draft as a reference (and any other cited standards).
  If they were derived from a project that's already listed in NOTICE.txt,
  that's fine, but please mention it. If they were derived from any other
  project (including Boost and libc++, which are not yet listed in
  NOTICE.txt), you must mention it here, so we can determine whether the
  license is compatible and what else needs to be done.

[msftclas]

All CLA requirements met.

[StephanTLavavej]

Everything here looks great, but a VSCode regular expression search for struct.*public finds 7 remaining occurrences: _Flist_simple_types in <forward_list>, _List_simple_types in <list>, four copies of param_type in <random>, and ctype_base in <xlocale>. Can you update those too?

[lozinska]

Thank you. I will fix it

[BillyONeal]

I'll kick off the test pass for this.

[BillyONeal]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[StephanTLavavej]

Thank you, and congratulations for your first merged commit!

[BillyONeal]

info  run completed in 00:06:44.4094864: 21695 passed, 0 failed

Thanks!