network: Show VPN empty state by default
The network panel used to show an empty box under the VPN header at start up if no VPNs were present instead of the empty state. This was because the GtkListBox containing VPN connections was visible by default instead of the empty state widget.
To fix this, the empty state widget has been moved to the top in the
GtkStack to show it by default. If any VPN connections are found during
initialization, cc-network-panel
already handles setting the
visibility of the appropriate widget correctly.
Fixes: #1634 (closed)