user-accounts: Rename new face images which conflicts with old ones

We want to add back legacy images, so let's rename the new ones to not
be in a conflict. This unfortunately can cause another breakage for
people which uses development versions, but we can't do much about it.

https://gitlab.gnome.org/GNOME/gnome-control-center/issues/5

panels/user-accounts/meson.build

@@ -22,10 +22,10 @@ image_data = files(
   'data/faces/book.jpg',
   'data/faces/calculator.jpg',
   'data/faces/cat.jpg',
-  'data/faces/coffee.jpg',
-  'data/faces/flower.jpg',
+  'data/faces/coffee2.jpg',
+  'data/faces/flower2.jpg',
   'data/faces/gamepad.jpg',
-  'data/faces/guitar.jpg',
+  'data/faces/guitar2.jpg',
   'data/faces/headphones.jpg',
   'data/faces/hummingbird.jpg',
   'data/faces/mountain.jpg',