Fix mention of `art_apex_test_host` in ART never-allow rules.

This ART module type used to be named `art_apex_test` but was not
properly renamed in ART never-allow rules.

Test: m
Bug: 129534335
Change-Id: Idba4ec9456db036155e0307902f917a2eb6866e0
diff --git a/build/art.go b/build/art.go
index e6157b4..1e6564b 100644
--- a/build/art.go
+++ b/build/art.go
@@ -294,7 +294,7 @@
 		"libart_static_cc_defaults",
 		"art_global_defaults",
 		"art_debug_defaults",
-		"art_apex_test",
+		"art_apex_test_host",
 	}
 	android.AddNeverAllowRules(
 		android.NeverAllow().