Round off the seeded ratio when checking for removal candidates

Signed-off-by: Stevie Robinson <stevie.robinson@gmail.com>

(cherry picked from commit c6bb6ad8788fb1c20ed466a495f2b47034947145)
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f