Both the Network panel and libnma expect UI resources in the
same location, which will cause problems when the Network panel loads
its own version that doesn't quite match up to the code used in libnma.
This fixes a crash when nma_wifi_dialog_new_for_hidden() is called and
libnma expects a domain widget to be present, which it isn't in our
version of the UI files.
https://bugzilla.gnome.org/show_bug.cgi?id=785099
The list of changes compared to the nm-connection-editor code is:
- Remove ":" from the control labels
- Right-justify the control labels
- Shrink the column spacing to 6
