contacts-window: remember width and hight of window

According to change request in issue #9 the contacts window will now store any size changes or the state maximized and restore it after closing.
1 job for bugfix/issue_9 in 10 minutes and 9 seconds (queued for 26 minutes and 8 seconds)
Status Job ID Name Coverage
  Build
passed #7555
build-gnome-contacts

00:10:09