fix(windows-rdp): properly escape username and password in patch file (#xxx)

- Updated the `patch_file_contents` to use `jsonencode` for `CODER_USERNAME` and `CODER_PASSWORD` to preserve special characters.

registry/coder/modules/windows-rdp/main.tf

@@ -52,8 +52,9 @@ resource "coder_script" "windows-rdp" {
     # doesn't allow recursive calls to the templatefile function. Have to feed
     # results of the JS template replace into the powershell template
     patch_file_contents = templatefile("${path.module}/devolutions-patch.js", {
-      CODER_USERNAME = var.admin_username
-      CODER_PASSWORD = var.admin_password
+      # Properly escape the username and password to preserve special characters
+      CODER_USERNAME = jsonencode(var.admin_username)
+      CODER_PASSWORD = jsonencode(var.admin_password)
     })
   })