lib/db: Update global counts on invalidation (fixes #4701)

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4702

lib/db/leveldb_transactions.go

@@ -168,7 +168,7 @@ insert:
 	if insertedAt == 0 {
 		// We just inserted a new newest version. Fixup the global size
 		// calculation.
-		if !file.Version.Equal(oldFile.Version) {
+		if !file.Version.Equal(oldFile.Version) || file.Invalid != oldFile.Invalid {
 			meta.addFile(globalDeviceID, file)
 			if hasOldFile {
 				// We have the old file that was removed at the head of the list.