mm-account: Don't set SMS validity
requested to merge alaraajavamma/chatty:alaraajavamma-wip/kop316/sending_failed_not-patch-44438 into main
Relative value of 168 results in the validity to be around 2 hours 50 minutes, which is very low. So instead, don't set validity time at all so that the default values are used.
Here are some details: https://www.freedesktop.org/software/ModemManager/doc/latest/libmm-glib/MMSmsProperties.html#mm-sms-properties-set-validity-relative
Afaik for example KDE Spacebar does not use any validity time and they don't have this issue in Plasma. Most carriers are using something between 36-72 hours so if we need to put something maybe we should go with the longest so 4320 :)? I changed also the branch.
related issue: #831
Hopefully I get this more right this time