ci-benchmark: switch final checks

Streams should time out after 2 minutes of inactivity, so we should
wait for that before deciding if backend is correctly responding to
login requests.

benchmarker/scripts/ci-benchmark

@@ -35,22 +35,22 @@ if ! curl -s -o /dev/null "$serverUrl"; then
  fail_job
 fi
 
+log 'Checking open DB query count...'
+timeout 120 bash -c "cd ..; while ! node lib/bin/check-open-db-queries.js; do sleep 1; done"
+
+log 'Checking backend is serving requests...'
 responseLog="$(mktemp)"
 requestBody='{"email":"'"$userEmail"'","password":"'"$userPassword"'"}'
 loginStatus="$(curl -s -o "$responseLog" -w '%{http_code}' \
  --header 'Content-Type: application/json' --data "$requestBody" \
  "$serverUrl/v1/sessions"
 )"
-if [[ "$loginStatus" = "200" ]]; then
- log 'Backend survived; job should pass.'
-else
+if [[ "$loginStatus" != "200" ]]; then
  log 'Backend behaving badly:'
  log "$(cat "$responseLog")"
  fail_job
 fi
-
-log 'Checking open DB query count...'
-timeout 120 bash -c "cd ..; while ! node lib/bin/check-open-db-queries.js; do sleep 1; done"
+log 'Backend survived; job passed.'
 
 # TODO upload results to getodk.cloud for graphing. Include:
 #