GNSS Metrics Fix.

Proto string wasn't decoding properly because it had extra information.

Bug: 145825965
Test: On device using raw metrics forced upload
	adb shell cmd jobscheduler run --force
	com.android.connectivity.metrics 6

Change-Id: Ifcf03b349c7c3997b25d06b15a0622fa013a1e66

services/core/java/com/android/server/LocationManagerService.java

@@ -3234,6 +3234,7 @@ public class LocationManagerService extends ILocationManager.Stub {
         synchronized (mLock) {
             if (mGnssManagerService != null && args.length > 0 && args[0].equals("--gnssmetrics")) {
                 mGnssManagerService.dump(fd, pw, args);
+                return;
             }
 
             ipw.println("Location Manager State:");