style(scripts): indent the purge zone jq filter by a multiple of two

The continuation lines of the zone-lookup filter sat at nine spaces, which fails
editorconfig-checker and blocks `prek run -a` for everyone. jq ignores the
leading whitespace, so the filter is unchanged: it still resolves the zone id
from both the object and the bare array response shape.

scripts/purge_cdn_zone.sh

@@ -70,8 +70,8 @@ resolve_zone_id() {
   zone_id=$(
     jq -r --arg hostname "${zone}" \
       '(if type == "object" then (.Items // []) else . end)[]
-         | select(any(.Hostnames[]?; .Value == $hostname))
-         | .Id' \
+        | select(any(.Hostnames[]?; .Value == $hostname))
+        | .Id' \
       "${response_file}"
   )
   rm -f "${response_file}"