Remove unused var from rbenv::version - unless
Remove unused var from rbenv::version - unless

Caused by some dodgy rebasing between 9151f70 and 5cb39c1.

Not caught by spec tests, because we only match partial strings. Should
consider matching the entire command in each test.

Also not caught by lint tests (which check for variable scoping) because we
don't exit on warnings. This will be fixed by applying
puppet-module-skeleton standards.

gds-operations/puppet-rbenv,gds-operations/puppet-rbenv