Clean up obsolete aliases for Truth.

Bug: 255714762
Test: presubmit
Change-Id: Ia8c6e15e15f86b823524009c1f946cbe13bad5d7
diff --git a/testing/Android.bp b/testing/Android.bp
index 3c100d8..903b98e 100644
--- a/testing/Android.bp
+++ b/testing/Android.bp
@@ -16,7 +16,7 @@
         "guava",
         "junit",
         "mockito-target-minus-junit4",
-        "truth-prebuilt",
+        "truth",
     ],
 
     sdk_version: "test_current",