Update windows_env.rb

Update legacy facts

Author: voreilly

lib/puppet/provider/windows_env/windows_env.rb

@@ -43,8 +43,8 @@ def evaluate
   desc 'Manage Windows environment variables'
 
   confine feature: :windows_env
-  confine osfamily: :windows
-  defaultfor osfamily: :windows
+  confine 'os.family': :windows
+  defaultfor 'os.family': :windows
 
   # For testing registry open result
   ERROR_FILE_NOT_FOUND = 2