Made the CI danger check a little more performant

danger/ci_config/Dangerfile

@@ -9,10 +9,11 @@ def get_ci_config_files(files)
 end
 
 schema_path = 'app/assets/javascripts/editor/schema/ci.json'
-ci_config_files = get_ci_config_files(all_changed_files)
 has_schema_update = all_changed_files.include?(schema_path)
+return if has_schema_update
 
-return if ci_config_files.empty? || has_schema_update
+ci_config_files = get_ci_config_files(all_changed_files)
+return if ci_config_files.empty?
 
 file_list = "- #{ci_config_files.map { |path| "`#{path}`" }.join("\n- ")}"