Let's actually wait that poezio is released to remove MUC workaround.

This reverts commit 91e52cb724.

poezio_omemo/__init__.py

@@ -155,6 +155,15 @@ class Plugin(E2EEPlugin):
             self.display_error('Unable to decrypt the message.')
             return None
 
+        # XXX: This is only needed to workaround a bug in poezio (fixed in
+        # 00a91774) that makes it not give us realjids. Remove when there is a
+        # poezio release including it.
+        # The realjid of the participant needs to be retrieved in a MUC.
+        if isinstance(tab, MucTab):
+            user = tab.get_user_by_name(jid.resource)
+            if user is not None and user.jid != JID(''):
+                jid = user.jid
+
         body = None
         try:
             encrypted = message['omemo_encrypted']