Clean up obsolete aliases for Truth.

Bug: 255714762
Test: presubmit
Change-Id: If91e9af5409fed9d5ccdd13749a0f562c545d589
diff --git a/nearby/tests/unit/Android.bp b/nearby/tests/unit/Android.bp
index 9b35452..112c751 100644
--- a/nearby/tests/unit/Android.bp
+++ b/nearby/tests/unit/Android.bp
@@ -42,7 +42,7 @@
         "mockito-target-extended-minus-junit4",
         "platform-test-annotations",
         "service-nearby-pre-jarjar",
-        "truth-prebuilt",
+        "truth",
         // "Robolectric_all-target",
     ],
     // these are needed for Extended Mockito