pwcli: edit: remove newlines from subject
pwcli: edit: remove newlines from subject

If Subject is long it's split into multiple lines and after edit the list
output is broken. Fix that by removing newlines.

Signed-off-by: Kalle Valo <7081a7d99b8c74c0698a728df19e3915a995d7e1@codeaurora.org>

kvalo/pwcli,kvalo/pwcli