script.sh: update to match main repo

ci/travis/script.sh

@@ -10,20 +10,8 @@
 
 header 'Running script.sh...'
 
-modified_cask_files () {
-  git diff --name-only --diff-filter=AM "${TRAVIS_COMMIT_RANGE}" -- Casks/*.rb
-}
-
-cask_files_added_outside_casks_dir () {
-  git diff --name-only --diff-filter=A "${TRAVIS_COMMIT_RANGE}" -- *.rb
-}
-
-modified_casks=($(modified_cask_files))
-casks_outside_casks_dir=($(cask_files_added_outside_casks_dir))
-
-if [[ ${#casks_outside_casks_dir[@]} -gt 0 ]]; then
-  odie "Casks added outside Casks directory: ${casks_outside_casks_dir[@]}"
-elif [[ ${#modified_casks[@]} -gt 0 ]]; then
+if any_casks_modified; then
+  modified_casks=($(modified_cask_files))
   run brew cask _audit_modified_casks "${TRAVIS_COMMIT_RANGE}"
   run brew cask style "${modified_casks[@]}"
 else