RFR: 8335349: jcmd VM.classloaders "fold" option should be optional

[Chris Plummer]

On Fri, 28 Jun 2024 16:58:06 GMT, Kevin Walls <kevinw at openjdk.org> wrote:

> Trivial tweak to ```ClassLoaderHierarchyDCmd::ClassLoaderHierarchyDCmd(outputStream* output, bool heap)``` to make _fold an optional argument.  
> 
> It still _is_ optional, but without this change it's not listed as optional in help.
> 
> The man page is already correct, and shows all the options as optional.

Marked as reviewed by cjplummer (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/19948#pullrequestreview-2148575658