fix(moderators): Make the self PIN row non-interactive

In the participant actions sheet, the current user's own row shows their
attendee PIN via the same `remove` slot used for actual remove/leave
actions, so tapping the PIN text fired ParticipantOpsAction.RemoveFromConversation
and removed the user from the conversation.
As a result i got:

2026-08-25 13:49:51.393 23038-23038 Conversati...oViewModel com.nextcloud.talk2 E  Error loading participants
   retrofit2.adapter.rxjava2.HttpException: HTTP 404

Every other branch of computeVisibility() already renders its PIN through
infoPin, a plain non-interactive row. Route the self row's PIN through
infoPin as well instead of wrapping it in a clickable RemoveOption.

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>
(cherry picked from commit 4613dd3)

Author: mahibi

app/src/main/java/com/nextcloud/talk/conversationinfo/ui/ParticipantOperationsSheet.kt

@@ -81,16 +81,14 @@ private fun computeVisibility(
         !canModerate -> ParticipantOpsVisibility()
 
         model.isSelf -> ParticipantOpsVisibility(
-            infoPin = null,
+            infoPin = pin,
             showPromote = false,
             showDemote = false,
             showPromoteToOwner = false,
             // An owner may step down, but only as far as moderator, to avoid locking themselves out
             showDemoteOwnerToModerator = canDemoteFromOwner,
             showDemoteOwnerToUser = false,
-            remove = pin?.let {
-                RemoveOption(R.drawable.ic_lock_grey600_24px, stringResource(R.string.nc_attendee_pin, it))
-            },
+            remove = null,
             showBan = false
         )