Restore branch filters

Well, this is why I get for reviewing PR's whilst tired.  In #575 we did
a fair amount of testing for a new app which required some Circle build
filter surgery.  Normally we squash all that nonsense before the PR is
merged....but it was missed.  Here we correct it.

.circleci/config.yml

@@ -327,39 +327,39 @@ workflows:
             - generate_docs_asciidoctor
   migrate_build_publish_keep_dev:
     jobs:
-      #- compile_contracts
-      #- migrate_contracts:
-      #    # filters:
-      #    #   branches:
-      #    #     only: master
-      #    context: keep-dev
-      #    requires:
-      #      - compile_contracts
-      #- publish_npm_package:
-      #    # filters:
-      #    #   branches:
-      #    #     only: master
-      #    context: keep-dev
-      #    requires:
-      #      - migrate_contracts
-      #- publish_contract_data:
-      #    # filters:
-      #    #   branches:
-      #    #     only: master
-      #    context: keep-dev
-      #    requires:
-      #      - migrate_contracts
+      - compile_contracts
+      - migrate_contracts:
+          filters:
+            branches:
+              only: master
+          context: keep-dev
+          requires:
+            - compile_contracts
+      - publish_npm_package:
+          filters:
+            branches:
+              only: master
+          context: keep-dev
+          requires:
+            - migrate_contracts
+      - publish_contract_data:
+          filters:
+            branches:
+              only: master
+          context: keep-dev
+          requires:
+            - migrate_contracts
       - build_relay_maintainer_initcontainer:
-          # filters:
-          #   branches:
-          #     only: master
+          filters:
+            branches:
+              only: master
           context: keep-dev
-          #requires:
-          #  - publish_npm_package
+          requires:
+            - publish_npm_package
       - publish_relay_maintainer_initcontainer:
-          # filters:
-          #   branches:
-          #     only: master
+          filters:
+            branches:
+              only: master
           context: keep-dev
           requires:
             - build_relay_maintainer_initcontainer