Display lake storage location

[philrz]

Repro is with Zui commit 9d91dd3.

@mattnibs recently noted he's often slowed down by the extra steps needed to confirm the filesystem path being used for local lake storage. For instance, at the moment we describe this in the Zui docs or a user could run ps | grep zed and look at the value used for the -lake flag. But indeed, to eliminate some user hassle, we could surely add this to the info shown when the user clicks Get info for their local lake that was launched by Zui.