GtkTerm does not remember selected port in Configuration->Port

[Norbert]

Steps to reproduce:
1. Open gtkterm
2. Select port and fill its parameters in Configuration->Port window
3. Make some work in its terminal
4. Open Configuration->Port window again (for example for changing port to new one).

Expected results:
* Configuration->Port window remembered all settings which were set previously (as in 2).

Actual results:
* Configuration->Port window does not remember settings which were set in previously (as in 2).

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gtkterm 0.99.7~rc1-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-109.156~precise2-generic 3.13.11-ckt39
Uname: Linux 3.13.0-109-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.15
Architecture: amd64
Date: Mon Feb 27 00:28:20 2017
InstallationMedia: Ubuntu 12.04.4 LTS "Precise Pangolin" - Release amd64 (20140204)
MarkForUpload: True
SourcePackage: gtkterm
UpgradeStatus: No upgrade log present (probably fresh install)