Reverts "Mark windows_host_engine_test flaky (flutter#167419)" (flutter#167425)

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Reverts: flutter#167419
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Initiated by: loic-sharma
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Reason for reverting: Test should no longer be flaky now that
flutter#167420 has landed.
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Original PR Author: matanlurey
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Reviewed By: {jtmcdole}
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This change reverts the following previous change:
See flutter#167418.
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Co-authored-by: auto-submit[bot] <flutter-engprod-team@google.com>

Author: auto-submit[bot]

engine/src/flutter/.ci.yaml

@@ -524,7 +524,6 @@ targets:
       - os=Windows
 
   - name: Windows windows_host_engine_test
-    bringup: true # Flaky https://github.com/flutter/flutter/issues/167418
     recipe: engine_v2/engine_v2
     timeout: 120
     properties: