Wellbeing Package needs to be enabled by default

Add the wellbeing application to keepEnabledPackages.
so, it will prevent the users to disable explicitly.

Test: NA
Bug: 180078180
Change-Id: I2645f30fac60106410eaf2126c10d8ab804fd1b7

src/com/android/settings/applications/ApplicationFeatureProviderImpl.java

@@ -180,6 +180,9 @@ public class ApplicationFeatureProviderImpl implements ApplicationFeatureProvide
         // Keep Package Installer enabled.
         keepEnabledPackages.add(mContext.getString(R.string.config_package_installer_package_name));
 
+        if (mPm.getWellbeingPackageName() != null) {
+            keepEnabledPackages.add(mPm.getWellbeingPackageName());
+        }
         return keepEnabledPackages;
     }