Disable the optimization mode preference if the app is not settable

https://screenshot.googleplex.com/BbQyEv6YCjPVwUF (allowlist)
https://screenshot.googleplex.com/3hTb8TQwGMQqcwS
https://screenshot.googleplex.com/6hdTAT2yNFucD9N (system app)
https://screenshot.googleplex.com/77T5JyAD5nZJpDT (normal app)

Fix: 281566984
Test: make test RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.fuelgauge.*
Change-Id: If7aa4b61bc806daa570187da24b7f454cd069dec

src/com/android/settings/fuelgauge/AdvancedPowerUsageDetail.java

@@ -343,7 +343,7 @@ public class AdvancedPowerUsageDetail extends DashboardFragment implements
         final String stateString;
         final String footerString;
 
-        if (!mBatteryOptimizeUtils.isValidPackageName()) {
+        if (mBatteryOptimizeUtils.isDisabledForOptimizeModeOnly()) {
             // Present optimized only string when the package name is invalid.
             stateString = context.getString(R.string.manager_battery_usage_optimized_only);
             footerString = context.getString(