Change task name (microsoft#7073)

Author: IanMatthewHuff

build/ci/vscode-python-nighly-flake-ci.yaml

@@ -33,7 +33,7 @@ jobs:
 # tags: "--tags=@smoke"
 # ignorePythonVersions: "3.6,3.5"
 
-- job: 'Nightly-Flake'
+- job: 'NightlyFlake'
  timeoutInMinutes: 120
  strategy:
  matrix: