Merge pull request #1980 from open-keychain/fix-duplicate-keys

fix loop bug in key selection

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/BackupCodeFragment.java

@@ -24,7 +24,6 @@ import android.animation.ValueAnimator.AnimatorUpdateListener;
 import android.annotation.SuppressLint;
 import android.content.Intent;
 import android.net.Uri;
-import android.os.AsyncTask;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;