Use newly added addParticipants instead of calling multiple times addParticipant

app/src/main/java/org/linphone/activities/call/viewmodels/ControlsViewModel.kt

@@ -369,9 +369,7 @@ class ControlsViewModel : ViewModel() {
         Log.i("[Call] Setting videoEnabled to [$currentCallVideoEnabled] in conference params")
 
         val conference = core.conference ?: core.createConferenceWithParams(params)
-        for (call in core.calls) {
-            conference?.addParticipant(call)
-        }
+        conference?.addParticipants(core.calls)
 
         toggleOptionsMenu()
     }