handle upgrading repositories initialized with --version=9

As was attempted earlier in the buggy commit 0d2e3058ee

Avoided the bug that had by making the upgrade log be updated after each
upgrade step. So, after upgrade from v8 to v9, the log is updated, and
so Upgrade.V9's timeOfUpgrade check will find that it was upgraded
recently and so won't let it skip ahead to v10.

Sponsored-by: k0ld on Patreon

Upgrade/V9.hs

@@ -40,12 +40,13 @@ upgrade automatic
 	 - and it is not safe for such to still be running after
 	 - this upgrade. -}
 	oldprocessesdanger = timeOfUpgrade (RepoVersion 9) >>= \case
-		Nothing -> pure True
 		Just t -> do
 			now <- liftIO getPOSIXTime
 			if now < t + 365*24*60*60
 				then return True
 				else assistantrunning
+		-- Initialized at v9, so no old process danger exists.
+		Nothing -> pure False
 
 	{- Skip upgrade when git-annex assistant (or watch) is running,
 	 - because these are long-running daemons that could conceivably