cosmic-store: enable desktop feature

recipes/tools/cosmic-store/recipe.toml

@@ -11,7 +11,7 @@ dependencies = [
 script = """
 export GETTEXT_DIR="${COOKBOOK_SYSROOT}"
 export GETTEXT_STATIC=1
-cookbook_cargo --no-default-features --features pkgar
+cookbook_cargo --no-default-features --features desktop,pkgar
 #TODO: install with just?
 APPID="com.system76.CosmicStore"
 mkdir -pv "${COOKBOOK_STAGE}/usr/share/applications/"