[perl #131496] [BUG] Failure.perl doesn't roundrip `handled` flag

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# New Ticket Created by  Zoffix Znet 
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Handled Failures are explosive again, if they're .perl'ed:

    <Zoffix__> m: given Failure.new { .so; .handled.say; .perl.EVAL.handled.say 
}
    <camelia> rakudo-moar 61ecfd: OUTPUT: «True␤False␤»

Perhaps the `handled` flag should be a public attribute, settable via new?