style: gofumpt all the things (#9829)

Literally `gofumpt -w .` from the top level dir. Guaranteed to be minor
style changes only and nothing else.

@imsodin per request?

lib/db/set_test.go

@@ -55,6 +55,7 @@ func globalList(t testing.TB, s *db.FileSet) []protocol.FileInfo {
 	})
 	return fs
 }
+
 func globalListPrefixed(t testing.TB, s *db.FileSet, prefix string) []db.FileInfoTruncated {
 	var fs []db.FileInfoTruncated
 	snap := snapshot(t, s)