Add more linebreaks in logcat package dump

The packages not previously known about by PreferencesHelper but that have notification permissions were all stuck on one line, whoops.

Bug: 194833441
Test: adb shell dumpsys notification
Change-Id: I1d58f676f6d34c5efd9c5540a678757e79e84a3c

services/core/java/com/android/server/notification/PreferencesHelper.java

@@ -2043,6 +2043,7 @@ public class PreferencesHelper implements RankingConfig {
                     pw.print(" importance=");
                     pw.print(NotificationListenerService.Ranking.importanceToString(
                             packagePermissions.get(p) ? IMPORTANCE_DEFAULT : IMPORTANCE_NONE));
+                    pw.println();
                 }
             }
         }