[mms-lib] Only report status REFUSED for errors 225, 229 and 235

Error 225 is actually pretty common (use of secondary SIM, roaming service
denied and so on). It usually means some sort of restriction imposed by the
operator and not. The status REFUSED should be represented in the UI with a
string like "Service denied" or "Rejected by the operator".
Merge pull request #29 from monich/service-denied

[mms-lib] Only report status REFUSED for errors 225, 229 and 235