Don't override ProfMessage Id with origin-id

Profanity sends the same value for both. Other clients might not.
Safe both since we could need them later.

Once we implement Last Message Correction we will need the regular id.
If we override it with origin-id and another client chooses to not use
the same value for id and origin-id then we can't interpret the id sent
with the LMC request correctly.

src/ui/mucwin.c

@@ -527,7 +527,7 @@ mucwin_incoming_msg(ProfMucWin *mucwin, ProfMessage *message, GSList *mentions,
     assert(mucwin != NULL);
     int flags = 0;
 
-    if (message_is_sent_by_us(message)) {
+    if (message_is_sent_by_us(message, TRUE)) {
         /* Ignore reflection messages */
         return;
     }