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/Directory.hs

@@ -55,6 +55,7 @@ gen r u c gc = do
 			hasKeyCheap = True,
 			whereisKey = Nothing,
 			remoteFsck = Nothing,
+			repairRepo = Nothing,
 			config = M.empty,
 			repo = r,
 			gitconfig = gc,