videoView: force redraw

If window closed when video running metal view redrawing will broke.
This patch force view redraw after setting a new frame.

Change-Id: I4497d2fdfe1bb89becefa1e4aeece072099d9f0a

src/views/CallMTKView.mm

@@ -215,6 +215,7 @@ bool frameDisplayed = false;
     [commandEncoder endEncoding];
     [commandBuffer presentDrawable:drawable];
     [commandBuffer commit];
+    [self draw];
 }
 
 -(simd::float4x4) getScalingMatrix:(CGFloat) ratio axis:(char) axis {