logger windows: avoid confusion about pid and thread id
logger windows: avoid confusion about pid and thread id

It makes clear which is process_id or thread_id.

Before:

  |2436|1032:

After:
  |2436|00001032:

komainu8/groonga,naoa/groonga,kenhys/groonga,naoa/groonga,naoa/groonga,kenhys/groonga,kenhys/groonga,groonga/groonga,komainu8/groonga,groonga/groonga,komainu8/groonga,kenhys/groonga,naoa/groonga,groonga/groonga,komainu8/groonga,naoa/groonga,groonga/groonga,groonga/groonga,komainu8/groonga,naoa/groonga,groonga/groonga,kenhys/groonga,komainu8/groonga,kenhys/groonga,naoa/groonga,komainu8/groonga,naoa/groonga,groonga/groonga,groonga/groonga,kenhys/groonga,komainu8/groonga,kenhys/groonga