Clean up obsolete aliases for Truth.

Bug: 255714762
Test: presubmit
Change-Id: I312d478f3bf73929e40f72b9fc8769ce5441fd9b
diff --git a/tests/helper/Android.bp b/tests/helper/Android.bp
index 6f07efd..614c70c 100644
--- a/tests/helper/Android.bp
+++ b/tests/helper/Android.bp
@@ -17,7 +17,7 @@
         "androidx.test.ext.junit",
         "com.android.microdroid.testservice-java",
         "MicrodroidTestHelper",
-        "truth-prebuilt",
+        "truth",
     ],
     sdk_version: "test_current",
 }