Fix format for public-staging.xml

The tooling for finalizing resources does not support closing the
resource in a seperate block

Flag: EXEMPT it was originally flagged with FLAG_ENABLE_ON_DEVICE_INTELLIGENCE_MODULE and still is
Bug: 389924241
Test: frameworks/base/tools/aapt2/tools/finalize_res.py \
      frameworks/base/core/res/res/values/public-staging.xml \
      frameworks/base/core/res/res/values/public-final.xml
Change-Id: Ide0bb04feb22f964001af505db44f4f97ed9cfb9