Shortened the duration of HUNs

Bug: 20917402
Change-Id: I7c1af3507b28a70432c5352f07530d0ea47a731c
diff --git a/packages/SystemUI/res/values/config.xml b/packages/SystemUI/res/values/config.xml
index 139462d..de5639b 100644
--- a/packages/SystemUI/res/values/config.xml
+++ b/packages/SystemUI/res/values/config.xml
@@ -141,7 +141,7 @@
     <bool name="config_show4GForLTE">true</bool>
 
     <!-- milliseconds before the heads up notification auto-dismisses. -->
-    <integer name="heads_up_notification_decay">10000</integer>
+    <integer name="heads_up_notification_decay">5000</integer>
 
     <!-- milliseconds after a heads up notification is pushed back
      before the app can interrupt again. -->