Update int.cloudbuild.yaml

Author: apeabody

build/int.cloudbuild.yaml

@@ -37,7 +37,6 @@ steps:
       # Do not prune if changing tests themselves
       _INFRA_FOLDERS="build test .github"
       while read _changed_folders; do 
-      for d in _changed_folders; do
         if [[ "${_INFRA_FOLDERS}" =~ "${_changed_folders%/}" ]]; then
           echo "Infrastructure folder ${_changed_folders%/} has changed; no tests will be pruned."
           exit 0 # do not prune