Fix "Keyword argument :when not one of" error

Occurs when expanding file templates with a :when clause.
+file-templates--expand wasn't anticipating it; throwing that error.

modules/feature/file-templates/autoload.el

@@ -58,7 +58,7 @@ these properties:
 ;;
 
 ;;;###autoload
-(cl-defun +file-templates--expand (pred &key project mode trigger ignore)
+(cl-defun +file-templates--expand (pred &key project mode trigger ignore _when)
   "Auto insert a yasnippet snippet into current file and enter insert mode (if
 evil is loaded and enabled)."
   (when (and pred (not ignore))