Update port_palermo_test.rb (#1605)

Author: wgwz

exercises/concept/port-palermo/port_palermo_test.rb

@@ -1,7 +1,7 @@
 require 'minitest/autorun'
 require_relative 'port_palermo'
 
-class MoviegoerTest < Minitest::Test
+class PortPalermoTest < Minitest::Test
   def test_identifier
     assert_equal :PALE, Port::IDENTIFIER
   end