FakeVim: Fix line selection for wrapped lines

Task-number: QTCREATORBUG-13102
Change-Id: I0845d98cdbca9a172a3ccda7b5730a7a2d5392b3
Reviewed-by: Lukas Holecek <hluk@email.cz>
Reviewed-by: hjk <hjk121@nokiamail.com>