codacy: avoid unused imports

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

src/main/java/com/owncloud/android/jobs/AccountRemovalJob.java

@@ -28,7 +28,6 @@ import android.accounts.Account;
 import android.accounts.AccountManager;
 import android.accounts.AccountManagerCallback;
 import android.accounts.AccountManagerFuture;
-import android.content.ContentResolver;
 import android.content.Context;
 import android.net.Uri;
 import android.os.Build;

src/main/java/com/owncloud/android/ui/activity/FolderPickerActivity.java

@@ -19,7 +19,6 @@
 
 package com.owncloud.android.ui.activity;
 
-import android.accounts.Account;
 import android.accounts.AuthenticatorException;
 import android.app.Activity;
 import android.content.BroadcastReceiver;

src/main/java/com/owncloud/android/ui/fragment/contactsbackup/ContactListFragment.java

@@ -89,7 +89,6 @@ import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashSet;
 import java.util.List;
-import java.util.Objects;
 import java.util.Set;
 
 import javax.inject.Inject;

src/main/java/com/owncloud/android/utils/FilesSyncHelper.java

@@ -64,8 +64,6 @@ import java.io.IOException;
 import java.util.Set;
 import java.util.concurrent.TimeUnit;
 
-import androidx.annotation.RequiresApi;
-
 import static com.owncloud.android.datamodel.OCFile.PATH_SEPARATOR;
 
 /**