Revert "Fix case of $0 truncating text due to being frozen"

This reverts commit f44436a.

Author: defunkt

lib/resque/worker.rb

@@ -456,13 +456,6 @@ def worker_pids
     # Procline is always in the format of:
     #   resque-VERSION: STRING
     def procline(string)
-      # Get around frozen $0
-      # Thanks to: http://www.ruby-forum.com/topic/187083#817010
-      $procline = $0
-      alias $PROC_LINE $0
-      alias $0 $procline
-      trace_var(:$0) {|val| $PROC_LINE = val}
-
       $0 = "resque-#{Resque::Version}: #{string}"
       log! $0
     end