Fix extra steps parameter name

Author: joperezr

eng/pipelines/runtime-linker-tests.yml

@@ -30,4 +30,4 @@ jobs:
       testGroup: innerloop
       nameSuffix: Runtime_Release
       buildArgs: -s clr+libs -c release /p:LinkerTests=true
-      postBuildExtraStepsTemplate: /eng/pipelines/libraries/execute-linker-tests-steps.yml
+      extraStepsTemplate: /eng/pipelines/libraries/execute-linker-tests-steps.yml