Discussion & threads start message does not follow 24/12h clock preference

[MIKI785]

Description:

When starting a new discussion or a thread, the timestamp in the original message starting it does not follow the clock format preference (Preferences -> Messages -> Time format).
The same issue appears in the Threads sidebar.

Steps to reproduce:

1. Set the clock format to 24h
2. Start a thread/discussion
3. Observe the timestamp

Expected behavior:

The timestamp should follow the same format as the rest.

Actual behavior:

The timestamp is always shown in a 12h format.

Server Setup Information:

Taken from the open.rocket.chat server.

[ggazzo]

closed by #14177