Fix nix-copy test

tests/nixos/nix-copy.nix

@@ -1,4 +1,6 @@
 # Test that ‘nix copy’ works over ssh.
+# Run interactively with:
+# rm key key.pub; nix run .#hydraJobs.tests.nix-copy.driverInteractive
 
 { lib, config, nixpkgs, hostPkgs, ... }:
 
@@ -55,7 +57,9 @@ in {
     server.wait_for_unit("sshd")
     client.wait_for_unit("network.target")
     client.wait_for_unit("getty@tty1.service")
-    client.wait_for_text("]#")
+    # Either the prompt: ]#
+    # or an OCR misreading of it: 1#
+    client.wait_for_text("[]1]#")
 
     # Copy the closure of package A from the client to the server using password authentication,
     # and check that all prompts are visible