Missed call LED pulse notification is... missing

When a call is received, the screen lights up and the InCallUI is
shown.  If the call goes unanswered a 'missed call' notification
is left, where the LED should also pulse; this pulsing is to indicate
that a missed call occurred even after the screen turns off.

This re-adds that functionality that was removed in:
5436923 Be more strict about triggering notification lights

Bug: 170735830
Test: atest BuzzBeepBlinkTest
Change-Id: If01e8f595affc874b2c9fee82a48283b6aeaceda

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

@@ -6964,15 +6964,15 @@ public class NotificationManagerService extends SystemService {
         if (record.getSbn().isGroup() && record.getNotification().suppressAlertingDueToGrouping()) {
             return false;
         }
-        // not if in call or the screen's on
-        if (isInCall() || mScreenOn) {
+        // not if in call
+        if (isInCall()) {
             return false;
         }
         // check current user
         if (!isNotificationForCurrentUser(record)) {
             return false;
         }
-
+        // Light, but only when the screen is off
         return true;
     }
 

services/tests/uiservicestests/src/com/android/server/notification/BuzzBeepBlinkTest.java

@@ -1185,7 +1185,7 @@ public class BuzzBeepBlinkTest extends UiServiceTestCase {
         NotificationRecord r = getLightsNotification();
         mService.buzzBeepBlinkLocked(r);
         verifyNeverLights();
-        assertFalse(r.isInterruptive());
+        assertTrue(r.isInterruptive());
         assertEquals(-1, r.getLastAudiblyAlertedMs());
     }