simplify invite handling

this also fixes a bug where the bot only joined invite-only rooms
whoops

bot.ps1

@@ -327,10 +327,7 @@ function Invoke-MatrixSync {
     #.PSObject.Properties because the rooms under .invite are [NoteProperty]
     $room_ids = $response.rooms.invite.PSObject.Properties.Name
     foreach($room_id in $room_ids) {
-        $invites = $response.rooms.invite.$room_id.invite_state.events | Where-Object {$_.content.join_rule -eq 'invite'}
-        foreach($invite in $invites) {
-            Join-MatrixRoom -RoomId $room_id
-        }
+        Join-MatrixRoom -RoomId $room_id
     }
 
     return $response.next_batch