User modes aren't propagated via IRC relay protocol

[TehPeGaSuS]

Bug summary

When connecting to weechat via IRC relay protocol with another weechat instance, the user modes aren't propagated and we end up not having any user/server modes on the instance connected via the IRC relay protocol.

Steps to reproduce

1. Connect one weechat instance directly to an IRC server
2. Connect another weechat instance via IRC relay protocol to the instance directly connected to the IRC server
3.  Compare the user modes on both instances. While the instance directly connected to the IRC server has the user and server modes displayed correctly, the instance connected via the IRC relay protocol has no user/server modes set

Current behavior

weechat<->IRC shows the current user and server modes but weechat<->weechat (via IRC relay) doesn't

Expected behavior

User modes should be the same on the weechat<->IRC and weechat<->weechat connection

Suggested solutions

Additional information

Weechat via IRC relay protocol:

Weechat via direct connection:

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• WeeChat version: WeeChat 4.1.0-dev (git: v4.0.0-66-g13241cdca) [compiled on Jul 21 2023 11:47:37]
• OS, distribution and version: Ubuntu 22.04.2 LTS
• Terminal: xfce4-terminal
• Terminal multiplexer (screen/tmux/…/none): tmux