Small improvement to survey workflow

Author: trask

.github/workflows/survey-on-merged-pr.yml

@@ -9,7 +9,7 @@ permissions:
 
 env:
   PR_NUM: ${{ github.event.pull_request.number }}
-  SURVEY_URL: https://docs.google.com/forms/d/e/1FAIpQLSf2FfCsW-DimeWzdQgfl0KDzT2UEAqu69_f7F2BVPSxVae1cQ/viewform?entry.1540511742=open-telemetry/opentelemetry-java-instrumentation
+  SURVEY_URL: https://docs.google.com/forms/d/e/1FAIpQLSf2FfCsW-DimeWzdQgfl0KDzT2UEAqu69_f7F2BVPSxVae1cQ/viewform?entry.1540511742=${{ github.repository }}
 
 jobs:
   comment-on-pr: