Fix scope of exec_occ function

scripts/upgrade

@@ -176,16 +176,16 @@ ynh_install_app_dependencies $pkg_dependencies
 # VERSION TO THE NEXT ONE
 #=================================================
 
-if [ "$upgrade_type" == "UPGRADE_APP" ]
-then
-    ynh_script_progression --message="Upgrading nextcloud..." --weight=3
-
 # Define a function to execute commands with `occ`
 exec_occ() {
 (cd "$final_path" && exec_as "$app" \
     php occ --no-interaction --no-ansi "$@")
 }
 
+if [ "$upgrade_type" == "UPGRADE_APP" ]
+then
+    ynh_script_progression --message="Upgrading nextcloud..." --weight=3
+
     # Load the last available version
     source upgrade.d/upgrade.last.sh
     last_version=$next_version