Fix CTS breakage for CtsDevicePolicyTestCases.

Ensure the idle check will be performed after bootup so that
the standby bucket could be refreshed immediately for the
protected packages.

Bug: 354599086
Test: atest CtsDevicePolicyTestCases:android.devicepolicy.cts.UserControlDisabledPackagesTest#setUserControlDisabledPackages_exemptFromStandbyBuckets
Change-Id: I6fb54a3bf035e06b8d3e4b2a7ec160cd830d4adc
diff --git a/apex/jobscheduler/service/java/com/android/server/usage/AppStandbyController.java b/apex/jobscheduler/service/java/com/android/server/usage/AppStandbyController.java
index c3fe031..d92351d 100644
--- a/apex/jobscheduler/service/java/com/android/server/usage/AppStandbyController.java
+++ b/apex/jobscheduler/service/java/com/android/server/usage/AppStandbyController.java
@@ -1990,7 +1990,7 @@
             }
         }
         if (android.app.admin.flags.Flags.disallowUserControlBgUsageFix()) {
-            if (!Flags.avoidIdleCheck()) {
+            if (!Flags.avoidIdleCheck() || mInjector.getBootPhase() >= PHASE_BOOT_COMPLETED) {
                 postCheckIdleStates(userId);
             }
         }