convert winrm put_file script template to Unicode string literal

Fixes traceback on homedirs with non-ascii chars

lib/ansible/plugins/connection/winrm.py

@@ -271,7 +271,7 @@ class Connection(ConnectionBase):
         if not os.path.exists(in_path):
             raise AnsibleFileNotFound('file or module does not exist: "%s"' % in_path)
 
-        script_template = '''
+        script_template = u'''
             begin {{
                 $path = "{0}"