Clean up obsolete aliases for Truth.

Bug: 255714762
Test: presubmit
Change-Id: I1a6394f6ff1cd56fac0f7a340857fdaee92fcbab
diff --git a/thread/tests/unit/Android.bp b/thread/tests/unit/Android.bp
index 1f16ad1..3a087c7 100644
--- a/thread/tests/unit/Android.bp
+++ b/thread/tests/unit/Android.bp
@@ -38,7 +38,7 @@
         "framework-connectivity-t-pre-jarjar",
         "guava-android-testlib",
         "net-tests-utils",
-        "truth-prebuilt",
+        "truth",
     ],
     libs: [
         "android.test.base",