Disable running r8-nolib shrinker on apps

Bug: 149519704
Change-Id: I61ccb798523225cde3634ffcb17b4b774e0b210f
diff --git a/tools/run_on_as_app.py b/tools/run_on_as_app.py
index cf26883..ee7cde4 100755
--- a/tools/run_on_as_app.py
+++ b/tools/run_on_as_app.py
@@ -1223,7 +1223,7 @@
     for shrinker in options.shrinker:
       assert shrinker in SHRINKERS
   else:
-    options.shrinker = [shrinker for shrinker in SHRINKERS]
+    options.shrinker = ['r8', 'r8-full']
   if options.hash or options.version:
     # No need to build R8 if a specific version should be used.
     options.no_build = True