Also use the notification's sound for the misc channel

Even if it's nonexistent.

Test: runtest systemui-notification
Change-Id: I1167fdf10b776460de696657dd49ab6f2be85753
Fixes: 37414045
diff --git a/core/java/android/app/Notification.java b/core/java/android/app/Notification.java
index 7f26f4f..b31e03f 100644
--- a/core/java/android/app/Notification.java
+++ b/core/java/android/app/Notification.java
@@ -2339,7 +2339,9 @@
     @Override
     public String toString() {
         StringBuilder sb = new StringBuilder();
-        sb.append("Notification(pri=");
+        sb.append("Notification(channel=");
+        sb.append(getChannel());
+        sb.append(" pri=");
         sb.append(priority);
         sb.append(" contentView=");
         if (contentView != null) {