Bring yelp back, run comps sync

Until we can preinstall flatpaks, we need the apps in the
base image that are needed for first login. Thats yelp, which
is used for the "welcome tour" part of the inial setup experience.

This sync also pulls in the new backgrounds package.

comps-sync-blacklist.yml

@@ -144,7 +144,6 @@ desktop_blacklist:
     - totem
     - totem-nautilus
     - traceroute
-    - yelp
   kde-desktop:
     # Incompatible with ostree for various reasons
     - abrt-desktop

fedora-common-ostree-pkgs.json

@@ -48,6 +48,7 @@
         "fedora-bookmarks",
         "fedora-release-workstation",
         "fedora-user-agent-chrome",
+        "fedora-workstation-backgrounds",
         "file",
         "filesystem",
         "firefox",

gnome-desktop-pkgs.json

@@ -57,6 +57,7 @@
         "tracker-miners",
         "xdg-desktop-portal",
         "xdg-desktop-portal-gtk",
-        "xdg-user-dirs-gtk"
+        "xdg-user-dirs-gtk",
+        "yelp"
     ]
 }