Skip tracking adjustments when there's no change.

Avoid incrementing the bg job count and other timer tracking
adjustments if the job is already being tracked.

Bug: 205295122
Test: atest --rerun-until-failure 25 FrameworksMockingServicesTests:QuotaControllerTest
Change-Id: I2b9690c95d3ea31ef37a5631fa8322e925da511c

apex/jobscheduler/service/java/com/android/server/job/controllers/QuotaController.java

@@ -2010,9 +2010,8 @@ public final class QuotaController extends StateController {
             if (DEBUG) {
                 Slog.v(TAG, "Starting to track " + jobStatus.toShortString());
             }
-            // Always track jobs, even when charging.
-            mRunningBgJobs.add(jobStatus);
-            if (shouldTrackLocked()) {
+            // Always maintain list of running jobs, even when quota is free.
+            if (mRunningBgJobs.add(jobStatus) && shouldTrackLocked()) {
                 mBgJobCount++;
                 if (mRegularJobTimer) {
                     incrementJobCountLocked(mPkg.userId, mPkg.packageName, 1);