Bug#1108063: #1108063 shelr broken by ruby 3.2+

[Rebecca N. Palmer]

Control: tags -1 patch

This is the only place exists() is used, so the obvious fix is this 
one-character change, but I have not tested whether there are also other 
issues.

--- a/lib/shelr/recorder.rb
+++ b/lib/shelr/recorder.rb
@@ -89,7 +89,7 @@ module Shelr
     end

     def check_record_dir
-      FileUtils.mkdir_p(record_dir) unless File.exists?(record_dir)
+      FileUtils.mkdir_p(record_dir) unless File.exist?(record_dir)
     end

     def init_terminal