test: fix wrong test name

Author: kou

test/parse/test_attribute_list_declaration.rb

@@ -7,7 +7,7 @@ module REXMLTests
   class TestParseAttributeListDeclaration < Test::Unit::TestCase
     include Test::Unit::CoreAssertions
 
-    def test_linear_performance_gt
+    def test_linear_performance_space
       seq = [10000, 50000, 100000, 150000, 200000]
       assert_linear_performance(seq, rehearsal: 10) do |n|
         REXML::Document.new("<!DOCTYPE schema SYSTEM \"foo.dtd\" [<!ATTLIST " +