std.prune preserve_order flag is not passed by default

[m-messiah]

The pre96 binary added preserve_order to std.prune, but in comparison to std.jsonManifestEx the flag added is not optional and fails the builds:

std.prune(['a', null, 'b'])

function argument is not passed: preserve_order
Function has the following signature: (a, preserve_order)
    resources/main:1:...: function <builtin_prune> call