Delete --android_aapt=aapt2 from Bazel's .bazelrc since it's now the default.

RELNOTES:
PiperOrigin-RevId: 290073081
diff --git a/.bazelrc b/.bazelrc
index 8153496..dace5e0 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -1,6 +1,3 @@
-# Flags for Android
-build --android_aapt=aapt2 # Turn aapt2 on by default for Bazel's own Android builds and tests.
-
 # Shared configuration flags to build and test Bazel on RBE.
 build:remote_shared --define=EXECUTOR=remote
 build:remote_shared --remote_instance_name=projects/bazel-untrusted/instances/default_instance