fix - invalid yaml that was breaking this workflow dialogflow-cx.yaml

while the error (Invalid workflow file: .github/workflows/dialogflow-cx.yaml#L77
You have an error in your yaml syntax on line 77) is reporting on a different line, I think it's the indentation on this line causing a problem

Author: iennae

.github/workflows/dialogflow-cx.yaml

@@ -78,7 +78,7 @@ jobs:
     - name: Run Tests
       run: make test dir=dialogflow-cx
       env:
-         GOOGLE_SAMPLES_PROJECT: "long-door-651"
+        GOOGLE_SAMPLES_PROJECT: "long-door-651"
         AGENT_ID: ${{ steps.secrets.outputs.agent_id }}
         TEST_ID: ${{ steps.secrets.outputs.test_id }}
         AGENT_PROJECT_ID: nodejs-docs-samples-tests