Drop legacy FreeBSD 11 workaround

[bastelfreak]

This was a workaround for legacy facter versions. The factsets in facterdb, for FreeBSD 11 & 12, all contain the ruby hash.

Removing this workaround removes a legacy fact, which makes the upgrade in #929 easier.

[bastelfreak]

From FacterDB:

$ for file in */freebsd*; do echo $file; jq '.ruby' $file; done
4.0/freebsd-11-x86_64.facts
{
  "platform": "amd64-freebsd11",
  "sitedir": "/usr/local/lib/ruby/site_ruby/2.7",
  "version": "2.7.3"
}
4.0/freebsd-12-x86_64.facts
{
  "platform": "amd64-freebsd12",
  "sitedir": "/usr/local/lib/ruby/site_ruby/2.7",
  "version": "2.7.4"
}
4.0/freebsd-13-x86_64.facts
{
  "platform": "amd64-freebsd13",
  "sitedir": "/usr/local/lib/ruby/site_ruby/2.7",
  "version": "2.7.4"
}
4.1/freebsd-11-x86_64.facts
{
  "platform": "amd64-freebsd11",
  "sitedir": "/usr/local/lib/ruby/site_ruby/2.7",
  "version": "2.7.3"
}
4.1/freebsd-12-x86_64.facts
{
  "platform": "amd64-freebsd12",
  "sitedir": "/usr/local/lib/ruby/site_ruby/2.7",
  "version": "2.7.4"
}
4.1/freebsd-13-x86_64.facts
{
  "platform": "amd64-freebsd13",
  "sitedir": "/usr/local/lib/ruby/site_ruby/2.7",
  "version": "2.7.4"
}
4.2/freebsd-11-x86_64.facts
{
  "platform": "amd64-freebsd11",
  "sitedir": "/usr/local/lib/ruby/site_ruby/2.7",
  "version": "2.7.3"
}
4.2/freebsd-12-x86_64.facts
{
  "platform": "amd64-freebsd12",
  "sitedir": "/usr/local/lib/ruby/site_ruby/2.7",
  "version": "2.7.4"
}
4.2/freebsd-13-x86_64.facts
{
  "platform": "amd64-freebsd13",
  "sitedir": "/usr/local/lib/ruby/site_ruby/2.7",
  "version": "2.7.4"
}
4.3/freebsd-13-x86_64.facts
{
  "platform": "amd64-freebsd13",
  "sitedir": "/usr/local/lib/ruby/site_ruby/3.1",
  "version": "3.1.4"
}
4.4/freebsd-13-x86_64.facts
{
  "platform": "amd64-freebsd13",
  "sitedir": "/usr/local/lib/ruby/site_ruby/3.1",
  "version": "3.1.4"
}
4.5/freebsd-12-x86_64.facts
{
  "platform": "amd64-freebsd12",
  "sitedir": "/usr/local/lib/ruby/site_ruby/3.1",
  "version": "3.1.4"
}
4.5/freebsd-13-x86_64.facts
{
  "platform": "amd64-freebsd13",
  "sitedir": "/usr/local/lib/ruby/site_ruby/3.1",
  "version": "3.1.4"
}