Add a flag to protect overwrite app optimization mode to restricted mode.

- Skip set app optimization mode to restricted if the flag disabled.

Bug: 348192536
Fix: 348192536
Test: atest
Flag: EXEMPT bug fix
Change-Id: I92d320ce1edfe9b7044afdcd058651b0d54bd6bd

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

@@ -88,6 +88,11 @@ public class PowerUsageFeatureProviderImpl implements PowerUsageFeatureProvider
         return false;
     }
 
+    @Override
+    public boolean isRestrictedModeOverwriteEnabled() {
+        return false;
+    }
+
     @Override
     public boolean isForceExpireAppOptimizationModeEnabled() {
         return false;