[sftp] Reformat sftpProtocol::GetRequest::GetRequest()

Summary: Signed-off-by: Andreas Schneider <asn@cryptomilk.org>

Reviewers: sitter, ngraham, broulik

Reviewed By: ngraham, broulik

Subscribers: kde-frameworks-devel, kfm-devel

Tags: #dolphin, #frameworks

Differential Revision: https://phabricator.kde.org/D15675