Clean up obsolete aliases for Truth.

Bug: 255714762
Test: presubmit
Change-Id: I7e29732e1e77e37cfb491521d14d2f3eb07deb36
diff --git a/packages/WallpaperBackup/Android.bp b/packages/WallpaperBackup/Android.bp
index 155dc1a..18f78314 100644
--- a/packages/WallpaperBackup/Android.bp
+++ b/packages/WallpaperBackup/Android.bp
@@ -49,7 +49,7 @@
         "androidx.test.core",
         "androidx.test.rules",
         "mockito-target-minus-junit4",
-        "truth-prebuilt",
+        "truth",
     ],
     resource_dirs: ["test/res"],
     certificate: "platform",