.pam_environment: s/$/@/ for PATH

NOTE: pam's env management is going away soon
https://github.com/linux-pam/linux-pam/issues/7#issuecomment-721595903

.pam_environment

@@ -2,7 +2,7 @@
 
 
 # Add home bin folder and ~/.node_modules/bin to $PATH
-PATH			DEFAULT= 	OVERRIDE=${HOME}/bin:${HOME}/.node_modues/bin:${PATH}
+PATH			DEFAULT= 	OVERRIDE=@{HOME}/bin:@{HOME}/.node_modues/bin:@{PATH}
 
 # Redirect npm global installs to user folder instead
 # Ref: https://wiki.archlinux.org/index.php/Node.js#Allow_user-wide_installations