Fix remote ask logic broken by refactor streak

hack/libhack/bootstrap.sh

@@ -75,7 +75,7 @@ check_dependencies() {
 }
 
 clone_required_repos_ask_ssh_or_https() {
-    if [[ "${HTTPS_REMOTES:-0}" == "1" ]]; then
+    if [[ -z "${HTTPS_REMOTES:-}" ]]; then
         read -p "Repos are pulled over SSH by default. Should I use HTTPS instead? [y/N]" -r -t 5 || :
         echo
         if [[ ${REPLY} =~ ^(y|Y|yes|Yes|YES)$ ]]; then