Fix some trailing whitespace issues in files in the tools directory.

Change-Id: If9e9b1dab1d6f521e20619a2a1d093749f0528d9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2671660
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72498}