[VM/Service] Add map update missing from socket profiling code

CoreLibraryReviewExempt: This CL does not include any core library API
changes, only socket profiling implementation changes.
Issue: #52875
Change-Id: Ia57fac86d721d7f57380dcc00753c4b77d289ad0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/411720
Commit-Queue: Derek Xu <[email protected]>
Reviewed-by: Jessy Yameogo <[email protected]>

Author: derekxu16

sdk/lib/io/network_profiling.dart

@@ -254,7 +254,7 @@ abstract class _SocketProfile {
                 addr.type == InternetAddress.loopbackIPv6)
             ? '[${addr.address}]'
             : addr.address;
-    _SocketStatistic(
+    _idToSocketStatistic[id.toString()] = _SocketStatistic(
       id.toString(),
       startTime: Timeline.now,
       socketType: type,