Remove file:// Uri from backup file picker

On Android SDK 24+ exposing a file Uri causes a failure.
Picking a file from a file chooser using data of a file://
Uri also hits this. As this is not necessary, removing the
Uri.

app/src/test/java/protect/card_locker/ImportExportActivityTest.java

@@ -40,10 +40,6 @@ public class ImportExportActivityTest
         info.activityInfo.exported = true;
 
         Intent intent = new Intent(handler);
-        if(handler.equals(Intent.ACTION_PICK))
-        {
-            intent.setData(Uri.parse("file://"));
-        }
 
         if(handler.equals(Intent.ACTION_GET_CONTENT))
         {