open https://gitlab.synchro.net/main/sbbs/-/issues/430

I'm creating a popup window using the following:

```
const popup = new Frame(
frame.x + 1,
Math.floor((frame.y + frame.height - 13) / 2),
frame.width - 2,
13,
BG_BLUE|WHITE,
frame
);
```
Now, when I write something with @-codes, it appears verbatim and isn't processed.

popup.putmsg("This node is @NODE@");

for example, puts "This node is @NODE@"

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