cue/load: make test OS-independent

Change-Id: I93614e539aaa4fc14f4f9e114e6c9b921e02a0dc
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/2284
Reviewed-by: Marcel van Lohuizen <mpvl@google.com>
diff --git a/cue/load/loader_test.go b/cue/load/loader_test.go
index 5d79d41..ee0884f 100644
--- a/cue/load/loader_test.go
+++ b/cue/load/loader_test.go
@@ -103,6 +103,8 @@
 				t.Errorf("error:\n got: %v\nwant: %v", err, tc.err)
 			}
 			got := strings.Join(data, ";")
+			// Make test work with Windows.
+			got = strings.Replace(got, string(filepath.Separator), "/", -1)
 			want := strings.TrimSpace(tc.want)
 			if got != want {
 				t.Errorf("got:\n%v\nwant:\n%v", got, want)