fix nightly build

Author: guschmue

ci_build/azure_pipelines/onnxruntime_nightly_test.yml

@@ -28,7 +28,7 @@ stages:
         report_coverage: 'True'
 
     - template: 'templates/job_generator.yml'
-    parameters:
+      parameters:
       platforms: ['linux', 'windows']
       python_versions: [3.7']
       tf_versions: ['1.15.2','2.1.0']