Fix jitsi information update for a closed_meeting

[Elblinator]

Describe the bug
If a meeting is closed from the inside and a superadmin tries to change the Jitsi domain, Jitsi room name or Jitsi room password, then the following Error is thrown:

Error: The user needs Permission user.can_update for meeting ##

Repo:

1. Close a meeting from inside
2. Login as a superadmin who is not in the meeting
3. Navigate to the edit view from this meeting
4. add information to the jitsi options
5. save
6. error is thrown

Wanted behaviour:
The superadmin should be allowed to change these three fields even if a meeting is locked from the inside

Additional context
I assume that the action:user.update should not be in the payload
Payload:

[
  {
    "action": "meeting.update",
    "data": [
      {
        "jitsi_domain": "domain name",
        "jitsi_room_name": "name for room",
        "jitsi_room_password": "very secure password",
        "id": 354
      }
    ]
  },
  {
    "action": "user.update",
    "data": [
      {
        "id": 1,
        "meeting_id": 354,
        "group_ids": [
          1897,
          1895
        ]
      },
      {
        "id": 9,
        "meeting_id": 354,
        "group_ids": [
          1895
        ]
      },
      {
        "id": 7243,
        "meeting_id": 354,
        "group_ids": [
          1894,
          1895
        ]
      }
    ]
  }
]

[peb-adr]

The quick fix for now should be to send only not send a user.update action for unchanged user information.

This should avoid the error and make it possible to change jitsi information even for closed meetings.

@rrenkert suggests that this implies a bigger discussion that we will not dive into at this point.