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).

client/client.go

@@ -514,7 +514,7 @@ func NewClient(cfg *config.Config, consulCatalog consul.CatalogAPI, consulProxie
 	go c.heartbeatStop.watch()
 
 	// Add the stats collector
-	statsCollector := stats.NewHostStatsCollector(c.logger, cfg.AllocDir, c.devicemanager.AllStats)
+	statsCollector := stats.NewHostStatsCollector(c.logger, c.GetConfig().AllocDir, c.devicemanager.AllStats)
 	c.hostStatsCollector = statsCollector
 
 	// Add the garbage collector