incidentd: Updating field IDs and a field name.

Field 7 was removed in http://ag/3248090. Since the protos aren't being
used yet, I want to update the rest of the IDs to avoid confusion in the
future when they start being used.
Also updated a field name to better reflect what the value is.

Bug: 65750801
Test: $ cts-tradefed run cts-dev --module CtsIncidentHostTestCases --test com.android.server.cts.AlarmManagerIncidentTest
Change-Id: I48724d461fa2e68dfaf452f01a84031d9fa4180e
diff --git a/services/core/java/com/android/server/AlarmManagerService.java b/services/core/java/com/android/server/AlarmManagerService.java
index ca15249..94f6109 100644
--- a/services/core/java/com/android/server/AlarmManagerService.java
+++ b/services/core/java/com/android/server/AlarmManagerService.java
@@ -2967,7 +2967,7 @@
 
             proto.write(AlarmProto.TAG, statsTag);
             proto.write(AlarmProto.TYPE, type);
-            proto.write(AlarmProto.WHEN_ELAPSED_MS, whenElapsed - nowElapsed);
+            proto.write(AlarmProto.TIME_UNTIL_WHEN_ELAPSED_MS, whenElapsed - nowElapsed);
             proto.write(AlarmProto.WINDOW_LENGTH_MS, windowLength);
             proto.write(AlarmProto.REPEAT_INTERVAL_MS, repeatInterval);
             proto.write(AlarmProto.COUNT, count);