chore: revise indents

Author: chalmerlowe

.kokoro/system.sh

@@ -94,10 +94,10 @@ packages_with_system_tests=(
   "google-cloud-datastore"
   "google-cloud-dns"
   "google-cloud-error-reporting"
-"sqlalchemy-spanner"
-"google-cloud-firestore"
-"google-cloud-logging"
-"google-cloud-testutils"
+  "sqlalchemy-spanner"
+  "google-cloud-firestore"
+  "google-cloud-logging"
+  "google-cloud-testutils"
 )
 
 # A file for running system tests