[Wifi Sync] Fix metrics logger to use correct histogram name

We were logging metrics to the wrong (non-existent) histogram.

This CL changes a constant so that we log to the correct histogram.

Bug: 1154341
Change-Id: I20bb0cc735e1f8e6d75e5f6d2c988c5188341509
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2642957Reviewed-by: Jon Mann <jonmann@chromium.org>
Commit-Queue: Claude van der Merwe <cvandermerwe@google.com>
Cr-Commit-Position: refs/heads/master@{#845814}

chromeos/components/sync_wifi/synced_network_metrics_logger.h

@@ -38,7 +38,7 @@ const char kApplyFailureReasonHistogram[] =
 const char kApplyResultHistogram[] =
     "Network.Wifi.Synced.UpdateOperation.Result";
 const char kZeroNetworksSyncedReasonHistogram[] =
-    "Network.Wifi.Synced.ZeroNetworksEligibleForSync.EligibilityStatus";
+    "Network.Wifi.Synced.ZeroNetworksEligibleForSync.Reason";
 
 const char kTotalCountHistogram[] = "Network.Wifi.Synced.TotalCount";