Update shotwell desktop file name references

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/774

data/org.gnome.shell.gschema.xml.in

@@ -50,7 +50,7 @@
       </description>
     </key>
     <key name="favorite-apps" type="as">
-      <default>[ 'epiphany.desktop', 'evolution.desktop', 'rhythmbox.desktop', 'shotwell.desktop', 'org.gnome.Nautilus.desktop', 'org.gnome.Software.desktop' ]</default>
+      <default>[ 'epiphany.desktop', 'evolution.desktop', 'rhythmbox.desktop', 'org.gnome.Shotwell.desktop', 'org.gnome.Nautilus.desktop', 'org.gnome.Software.desktop' ]</default>
       <summary>List of desktop file IDs for favorite applications</summary>
       <description>
         The applications corresponding to these identifiers

js/ui/appFavorites.js

@@ -55,6 +55,7 @@ const RENAMED_DESKTOP_IDS = {
     'org.gnome.taquin.desktop': 'org.gnome.Taquin.desktop',
     'org.gnome.Weather.Application.desktop': 'org.gnome.Weather.desktop',
     'polari.desktop': 'org.gnome.Polari.desktop',
+    'shotwell.desktop': 'org.gnome.Shotwell.desktop',
     'tali.desktop': 'org.gnome.Tali.desktop',
     'totem.desktop': 'org.gnome.Totem.desktop',
     'evince.desktop': 'org.gnome.Evince.desktop',