fix syntax for the publishUsingPipelines variable (dotnet/corefx#40545)

Commit migrated from https://github.com/dotnet/corefx/commit/20cce62d9853d9e3bf5d110a778cd1fd32772e62

diff --git a/eng/pipelines/libraries/pre-publish.yml b/eng/pipelines/libraries/pre-publish.yml
index f95355a..d214091 100644 (file)
--- a/eng/pipelines/libraries/pre-publish.yml
+++ b/eng/pipelines/libraries/pre-publish.yml
@@ -10,7 +10,7 @@ stages:
     - template: ../common/templates/jobs/jobs.yml
       parameters:
         enableMicrobuild: true
-        enablePublishUsingPipelines: ${{ variables._PublishUsingPipelines }}
+        enablePublishUsingPipelines: $(_PublishUsingPipelines)
         enablePublishBuildAssets: true
         enablePublishBuildArtifacts: true
         jobs: