build.sh: don't wipe the campus kit zip in dist

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/build.sh

@@ -2,7 +2,7 @@
 # Build dist/message-notes.pyz (zipapp) and copy the Desktop launcher next to it.
 set -euo pipefail
 cd "$(dirname "$0")/.."
-rm -rf dist build/pyz && mkdir -p dist build/pyz
+rm -rf build/pyz "dist/message-notes.pyz" "dist/Message Notes to ProPresenter.command" && mkdir -p dist build/pyz
 cp src/*.py src/schema.json apps-script/SaveSermonNotes.gs build/pyz/
 rm -rf build/pyz/__pycache__
 /usr/bin/python3 -m zipapp build/pyz -o dist/message-notes.pyz -p "/usr/bin/env python3"