fix wrong trace from IpConnectivityMetrics

- should use only traceEnd() after traceBeginAndSlog

bug: 32256110
Test: manual log check
Change-Id: If7dcceacd316450990402a1a20877ceb8c85a098

services/java/com/android/server/SystemServer.java

@@ -732,7 +732,7 @@ public final class SystemServer {
 
             traceBeginAndSlog("IpConnectivityMetrics");
             mSystemServiceManager.startService(IpConnectivityMetrics.class);
-            Trace.traceEnd(Trace.TRACE_TAG_SYSTEM_SERVER);
+            traceEnd();
 
             traceBeginAndSlog("PinnerService");
             mSystemServiceManager.startService(PinnerService.class);