QtClient: fix for video

Refs #71984

Change-Id: I7fd756d52e9a54516710ce7748911020dfe7b7e6
diff --git a/videowidget.h b/videowidget.h
index 84d8ab4..04564b7 100644
--- a/videowidget.h
+++ b/videowidget.h
@@ -38,7 +38,7 @@
 
 public slots:
     void previewStarted(Video::Renderer* renderer);
-    void previewStopped(Video::Renderer* renderer);
+    void previewStopped();
     void frameFromPreview();
     void callInitiated(Call *call, Video::Renderer *renderer);
     void frameFromDistant();