Revert "include object_id in inspect result"

This reverts commit d83a394.

Author: Ron Dahlgren

lib/serpapi/client.rb

@@ -183,7 +183,7 @@ def close
 
     def inspect
       masked_key = api_key && (api_key.length > 8 ? "#{api_key[..3]}****#{api_key[-4..]}" : '****')
-      "#<#{self.class}:#{format('%#016x', object_id << 1)} @engine=#{engine} @timeout=#{timeout} @persistent=#{persistent} api_key=#{masked_key}>"
+      "#<#{self.class} @engine=#{engine} @timeout=#{timeout} @persistent=#{persistent} api_key=#{masked_key}>"
     end
 
     private