Revert "If didSomething condition is reversed."

This CL also cause app start time regression per b/155339573.

This reverts commit f759a58e3b.

Reason for revert: b/155262799
Bug: 155339573

Change-Id: I3e26bc2556f4655d751d0aab239ca7b6c2232689

services/core/java/com/android/server/am/ActivityManagerService.java

@@ -5364,7 +5364,7 @@ public class ActivityManagerService extends IActivityManager.Stub
             return false;
         }
 
-        if (didSomething) {
+        if (!didSomething) {
             updateOomAdjLocked(app, OomAdjuster.OOM_ADJ_REASON_PROCESS_BEGIN);
             checkTime(startTime, "attachApplicationLocked: after updateOomAdjLocked");
         }