Small fix

app/src/main/java/eu/faircode/email/EntityFolder.java

@@ -21,9 +21,9 @@ package eu.faircode.email;
 
 import android.content.Context;
 import android.content.SharedPreferences;
-import android.preference.PreferenceManager;
 
 import androidx.annotation.NonNull;
+import androidx.preference.PreferenceManager;
 import androidx.room.Entity;
 import androidx.room.ForeignKey;
 import androidx.room.Index;

app/src/main/java/eu/faircode/email/FragmentFolder.java

@@ -24,7 +24,6 @@ import android.content.DialogInterface;
 import android.content.SharedPreferences;
 import android.os.Build;
 import android.os.Bundle;
-import android.preference.PreferenceManager;
 import android.text.TextUtils;
 import android.view.LayoutInflater;
 import android.view.Menu;
@@ -39,6 +38,7 @@ import android.widget.EditText;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.preference.PreferenceManager;
 
 import com.google.android.material.snackbar.Snackbar;
 

app/src/main/java/eu/faircode/email/ServiceSend.java

@@ -29,13 +29,13 @@ import android.net.Network;
 import android.net.NetworkCapabilities;
 import android.net.NetworkRequest;
 import android.os.PowerManager;
-import android.preference.PreferenceManager;
 import android.text.TextUtils;
 
 import androidx.core.app.NotificationCompat;
 import androidx.core.content.ContextCompat;
 import androidx.lifecycle.LifecycleService;
 import androidx.lifecycle.Observer;
+import androidx.preference.PreferenceManager;
 
 import java.io.File;
 import java.io.IOException;

app/src/main/java/eu/faircode/email/WorkerCleanup.java

@@ -23,9 +23,9 @@ import android.content.Context;
 import android.content.SharedPreferences;
 import android.net.Uri;
 import android.os.Build;
-import android.preference.PreferenceManager;
 
 import androidx.annotation.NonNull;
+import androidx.preference.PreferenceManager;
 import androidx.work.Constraints;
 import androidx.work.ExistingPeriodicWorkPolicy;
 import androidx.work.PeriodicWorkRequest;

app/src/main/java/eu/faircode/email/WorkerPoll.java

@@ -21,9 +21,9 @@ package eu.faircode.email;
 
 import android.content.Context;
 import android.content.SharedPreferences;
-import android.preference.PreferenceManager;
 
 import androidx.annotation.NonNull;
+import androidx.preference.PreferenceManager;
 import androidx.work.ExistingPeriodicWorkPolicy;
 import androidx.work.PeriodicWorkRequest;
 import androidx.work.WorkManager;