Search sample/prelude-modules.el in prelude-dir during init

If the user installed prelude to different directory
via the `PRELUDE_INSTALL_DIR` variable then the sample
file won't be found in the `user-emacs-directory`.

CHANGELOG.md

@@ -27,6 +27,7 @@
 * [#1335](https://github.com/bbatsov/prelude/issues/1335): Workaround
   for `which-key` bug causing display issues in clients to `emacs --daemon`.
 * Fix **Edit on GitHub** link in ReadTheDocs site.
+* Fix fall back to sample `prelude-modules.el` not working if user has installed to non-default location.
 
 ## 1.1.0 (2021-02-14)
 

init.el

@@ -138,7 +138,7 @@ by Prelude.")
   (message "[Prelude] Missing personal modules file %s" prelude-modules-file)
   (message "[Prelude] Falling back to the bundled example file sample/prelude-modules.el")
   (message "[Prelude] You should copy this file to your personal configuration folder and tweak it to your liking")
-  (load (expand-file-name "sample/prelude-modules.el" user-emacs-directory)))
+  (load (expand-file-name "sample/prelude-modules.el" prelude-dir)))
 
 ;; config changes made through the customize UI will be stored here
 (setq custom-file (expand-file-name "custom.el" prelude-personal-dir))