fix: Change ownership of destination folder

The "old_users" folders in users' home and work could be created with
root owner instead of the intended user.

clean_up_accounts.sh

@@ -156,8 +156,10 @@ move_folder() {
     supervisor_group=$(id -gn $supervisor)
     # Change ownership
     chown -R $supervisor:$supervisor_group "$src"
-    # Create dir
+    # Create destination folder if needed
     mkdir -p "$dest"
+    # Change ownership of destination (always done)
+    chown $supervisor:$supervisor_group "$dest"
     # Move it
     mv "$src" "$dest"
 }