FileOperationsHelper: remove duplicated flags in openFile

Already set for all intents a bit below

Signed-off-by: Álvaro Brey Vilas <alvaro.brey@nextcloud.com>

src/main/java/com/owncloud/android/ui/helpers/FileOperationsHelper.java

@@ -405,7 +405,6 @@ public class FileOperationsHelper {
             String guessedMimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(fileExt);
             if (guessedMimeType != null) {
                 openFileWithIntent = new Intent(Intent.ACTION_VIEW);
-                openFileWithIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
                 openFileWithIntent.setDataAndType(
                         fileUri,
                         guessedMimeType