fix `api 30+` error on `_recreateAfterGettingApps=true`

[niektuytel]

        at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:5111)
        at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:5140)
        at android.app.ActivityThread.handleRelaunchActivityInner(ActivityThread.java:5432)
        at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5362)
        at android.app.servertransaction.ActivityRelaunchItem.execute(ActivityRelaunchItem.java:69)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at android.app.ClientTransactionHandler.executeTransaction(ClientTransactionHandler.java:58)
        at android.app.ActivityThread.handleRelaunchActivityLocally(ActivityThread.java:5415)
        at android.app.ActivityThread.access$3300(ActivityThread.java:237)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2076)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7656)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
     Caused by: java.lang.NullPointerException: Attempt to read from field 'com.android.server.appwidget.AppWidgetServiceImpl$ProviderId ```

reproduce run app on android `api 30+` and open hide apps in the settings, than click on the back arrow >> error
the thing is when you recreate the Activity he will crash on his `onDestroy()` so that is why I change it to `onContentChanged()` on line 239

kind regards Niek Tuytel (Okido)

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