Change tab name format to ProfileName @ Port.

Summary:
I accidentally set the AtCoreInstance name to the devices Baud. This fixes that and add an enhancement to the title that show the Port the device is on. This is helpful because there is currently no way to show the port the device is on after connecting.

Old:

Should show profile name "I3", set to devices baud by mistake.
New:
Profile name @ Port.

Reviewers: laysrodrigues, tcanabrava, patrickelectric

Reviewed By: laysrodrigues, patrickelectric

Subscribers: Atelier

Tags: Atelier

Differential Revision: https://phabricator.kde.org/D21768