[rts] Improve presentation
[rts] Improve presentation

When printing progress, "%5d/%5d" results in " 1000/ 2000" string.
"%5d" is not needed for total number because it is constant. Use "%d".

R=tandrii@chromium.org

Bug: 1112125
Change-Id: I664a8bddd37b73473674fa8922c12034442e979e
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/2434669
Commit-Queue: Nodir Turakulov <ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org>
Reviewed-by: Andrii Shyshkalov <a30c74fa30536fe7ea81ed6dec202e35e149e1fd@google.com>
Auto-Submit: Nodir Turakulov <ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org>

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