SftpTransfer: Get rid of FileTransferErrorHandling enum

FileTransferErrorHandling::Ignore wasn't used anywhere.

Change-Id: I5826fc9f7871b06cd8f423d7e3b1d01a5b6cbdff
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/remotelinux/linuxdevicetester.cpp

@@ -193,8 +193,7 @@ void GenericLinuxDeviceTester::handlePortListReady()
     }
 
     emit progressMessage(tr("Checking whether an SFTP connection can be set up..."));
-    d->sftpTransfer = d->connection->createDownload(FilesToTransfer(),
-                                                    FileTransferErrorHandling::Abort);
+    d->sftpTransfer = d->connection->createDownload(FilesToTransfer());
     connect(d->sftpTransfer.get(), &SftpTransfer::done,
             this, &GenericLinuxDeviceTester::handleSftpFinished);
     d->state = TestingSftp;