PeerName: do not set it to empty when call is over
PeerName: do not set it to empty when call is over

The call details map<string string> has mostly empty values once the call is over,
we do not want it to override an existing peer name to be empty in this case.
This results in the display name being saved in the call history.

Issue: #80221
Change-Id: I119bded6c79f226c67418538ce835ff54eae7521

savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc