avoid duplicate add action for v6 unlocked modified file

The new second pass sees the file as type changed because the first
pass's changes have typically not reached git yet. So, have to
explicitly check for unmodified files in the second pass.

Note that, if the file has been touched but not really modified,
the first pass will handle it, and so the second pass does nothing.

This commit was sponsored by Jochen Bartl on Patreon.

Command/Add.hs

@@ -70,7 +70,7 @@ seek o = allowConcurrentOutput $ do
 				go (withFilesNotInGit (not $ includeDotFiles o))
 			go withFilesMaybeModified
 			ifM versionSupportsUnlockedPointers
-				( go withUnlockedPointersToBeCommitted
+				( go withUnmodifiedUnlockedPointers
 				, unlessM isDirect $
 					go withFilesOldUnlocked
 				)