Prevent duplicate call summaries

[nickvergessen]

Steps

1. Add breakpoint at
   

   spreed/lib/Activity/Listener.php

   Line 111 in 459858a

   $activeSince = $room->getActiveSince();

2. Add breakpoint at
   

   spreed/lib/Activity/Listener.php

   Line 125 in 459858a

   $numGuests = $room->getActiveGuests();

3. Start a call with 2 users
4. Leave call with both users
5. Wait until both requests are at breakpoint 1
6. Wait until both requests are at breakpoint 2
7. Request 1 step until
   

   spreed/lib/Activity/Listener.php

   Line 132 in 459858a

   $actorId = $userIds[0] ?? 'guests-only';

8. Request 2 step and and it should return on
   

   spreed/lib/Activity/Listener.php

   Line 129 in 459858a

   return false;

Before this PR you will not enter the if in request 2 and therefor generate 2 call summaries

[PVince81]

👍 as discussed

[nickvergessen]

/backport to stable20.1

[nickvergessen]

/backport to stable20

[danxuliu]

Tested (with SQLite) and works 👍 Code makes sense.