[tx] Enable V option (remove overlaps) for UFO mode

[miguelsousa]

I thought it would be just a matter of making this change

diff --git a/c/tx/source/tx.c b/c/tx/source/tx.c
index f508aa76..188c18a1 100644
--- a/c/tx/source/tx.c
+++ b/c/tx/source/tx.c
@@ -860,6 +860,7 @@ static void parseArgs(txCtx h, int argc, char *argv[]) {
                 switch (h->mode) {
                     case mode_cff:
                     case mode_t1:
+                    case mode_ufow:
                         h->flags &= ~PATH_REMOVE_OVERLAP;
                         break;
                     default:
@@ -870,6 +871,7 @@ static void parseArgs(txCtx h, int argc, char *argv[]) {
                 switch (h->mode) {
                     case mode_cff:
                     case mode_t1:
+                    case mode_ufow:
                         h->flags |= PATH_REMOVE_OVERLAP;
                         break;
                     default:

but it's more than that because using +V had no effect; the resulting UFO still had overlaps.