Fix inttest/ct2 ct spec file location (Thanks Peter Andersson)

The DirRef in the spec file is relative to the directory where the spec
file is located. ct2_rt was erroneously copying the spec file to test/.

inttest/ct2/ct2_rt.erl

@@ -6,7 +6,7 @@
 files() ->
     [{create, "ebin/foo.app", app(foo)},
      {copy, "../../rebar", "rebar"},
-     {copy, "foo.test.spec", "test/foo.test.spec"},
+     {copy, "foo.test.spec", "foo.test.spec"},
      {copy, "foo_SUITE.erl", "test/foo_SUITE.erl"}].
 
 run(_Dir) ->