Revert "nixos/grub: generate BLS entries"

nixos/tests/nixos-rebuild-install-bootloader.nix

@@ -71,8 +71,5 @@ import ./make-test-python.nix ({ pkgs, lib, withNg ? false, ... }: {
           # at this point we've tested regression #262724, but haven't tested the bootloader itself
           # TODO: figure out how to how to tell the test driver to start the bootloader instead of
           # booting into the kernel directly.
-
-      with subtest("New boot entry has been added"):
-          machine.succeed("test -f /boot/loader/entries/nixos-generation-2.conf")
     '';
 })