fix cut-and-paste problem with subproject path

[SVN r19084]

test/Jamfile

@@ -8,7 +8,7 @@
 
 
 # Testing Jamfile autogenerated from XML source
-subproject libs/conversion/test ;
+subproject libs/utility/test ;
 
 # bring in rules for testing
 SEARCH on testing.jam = $(BOOST_BUILD_PATH) ;