Fixing error in option name

Author: davefx

dfx-random-user-id.php

@@ -134,7 +134,7 @@ function dfx_random_user_dismissed_activation_msg() {
 // Delete both the option to show the notice and the option keeping the new user id
 // to avoid database clutter. The less information in the database, the better.
 
-delete_option( 'dfx_randomuserid_activation_notice_dismissed' );
+delete_option( 'dfx_randomuserid_activation_show_activation_notice' );
 delete_option( 'dfx_randomuserid_first_user_moved_to' );
 
 }