chore(nightly build): fix nightly's display name

azure-pipelines/common/variables.yml

@@ -1,7 +1,7 @@
 variables:
   test_extension_name: test-extension-name-placeholder
-  test_display_name: 'Test Display Name Placeholder For RC'
+  test_display_name: 'Display Name Placeholder For RC'
   test_publisher: IoTDevExBuild
   nightly_extension_name: nightly-extension-name-placeholder
-  nightly_display_name: 'Nightly Display Name Placeholder For Nightly'
+  nightly_display_name: 'Display Name Placeholder For Nightly'
   nightly_publisher: IoTDevExBuild

azure-pipelines/nightly_build.yml

@@ -34,7 +34,7 @@ steps:
   # modify package.json for release candidates
   # including k/v pairs in cli arguments, remove trailing -rc if presents
   - script: |
-      node scripts/modifyPackageJson.js name $(nightly_extension_name) displayName "$(test_display_name)" aiKey ${TEST_AIKEY} publisher $(nightly_publisher)
+      node scripts/modifyPackageJson.js name $(nightly_extension_name) displayName "$(nightly_display_name)" aiKey ${TEST_AIKEY} publisher $(nightly_publisher)
     displayName: Modify package.json for release candidates
 
   - template: common/package_steps.yml