Freeze break: gnome-shell: two cosmetic network menu issues

[Owen Taylor <otaylor redhat com>]

1) When you expand the wireless "More" menu it animates out to 
   a much larger size, then pops to the right size.

   https://bugzilla.gnome.org/show_bug.cgi?id=645949

  Patch is a very simple reordering of a couple of lines of code.

  (There's a much worse problem with this menu in that it can
  overflow the screen if there are two many visible access points,
  but we're unlikely to get a fix for that for 3.0.0)

2) When the "encrpyted network" icons were added to the menu, the
   signal strength icons no longer showed up in a single column, but
   bounce between two different columns.

   https://bugzilla.gnome.org/show_bug.cgi?id=646121

   Patch is simple and adds an empty icon when there is no signal
   encrpyted icon restoring the alignment.