assistant: Support repairing git remotes that are locally accessible

(eg, on removable drives)

gcrypt remotes are not yet handled.

This commit was sponsored by Sören Brunk.

Remote/S3.hs

@@ -63,6 +63,7 @@ gen r u c gc = new <$> remoteCost gc expensiveRemoteCost
 			hasKeyCheap = False,
 			whereisKey = Nothing,
 			remoteFsck = Nothing,
+			repairRepo = Nothing,
 			config = c,
 			repo = r,
 			gitconfig = gc,