config: Drop com.endlessm.photos

The com.endlessm.photos is going to be EOL on Flathub [1] and has not
been maintained for a long time. So, drop it from the default apps.
Change the config example accordingly, too.

[1]: flathub/com.endlessm.photos#12

Author: starnight

config/defaults.ini

@@ -451,7 +451,6 @@ apps_add_mandatory =
   org.libreoffice.LibreOffice
 apps_add =
   cc.arduino.IDE2
-  com.endlessm.photos
   com.endlessnetwork.aqueducts
   com.endlessnetwork.dragonsapprentice
   com.endlessnetwork.fablemaker

config/local.ini.example

@@ -48,4 +48,4 @@ apps =
 # Completely override the set of installed Flathub apps. See documentation
 # for eos-apps above.
 apps =
-  com.endlessm.photos
+  org.gnome.Loupe