[MERGE] Change the `bzr init-repo` default to --trees (#53483)

[Aaron Bentley]

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John Arbash Meinel wrote:
> Aaron's earlier work means that all boolean options have a (hidden)
> negative of "--no-X".

Actually, option negation is bidirectional: "trees" => "no-trees",
"no-trees" => "trees".

> As an example for the help text, I would just put the negative just
> before the positive, and leave the help text alone. So you would get:
> 
> 
>   --no-trees
>   --trees	Set whether new branches inside the repository will
> 		default to having a working tree or not.

Yes, grouping related options is very easy, and I think showing options
with blank help is also no problem.

Aaron
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