client: stats need latest allocdir (#14204)
client: stats need latest allocdir (#14204)

In #14139 this code was changed to use the original copy of the config,
but Config.AllocDir is updated in the `Client.init()` method for dev
agents.

This uses the latest version of the alloc dir (which cannot change
further at runtime without a client restart which would reinitialize
the stats collector as well).
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