video: keep aspect ratio

Refs #74168

Change-Id: I3482b7cc43d7c4f5f8d7fe9279e30ed7760aa8c9
diff --git a/callwidget.cpp b/callwidget.cpp
index 168aea1..deed297 100644
--- a/callwidget.cpp
+++ b/callwidget.cpp
@@ -47,6 +47,7 @@
     ui->muteMicButton->setCheckable(true);
     ui->muteSpeakerButton->setCheckable(true);
     ui->callInvite->setVisible(false);
+    ui->videoWidget->setVisible(false);
 
     setActualCall(nullptr);
     videoRenderer_ = nullptr;