make the size looks better for horizontal screen

QtScrcpy/device/ui/videoform.cpp

@@ -145,7 +145,8 @@ void VideoForm::updateShowSize(const QSize &newSize)
                 showSize.setHeight(qMin(newSize.height(), screenRect.height() - 200));
                 showSize.setWidth(showSize.height() * m_widthHeightRatio);
             } else {
-                showSize.setWidth(qMin(newSize.width(), screenRect.width()/2));
+                //showSize.setWidth(qMin(newSize.width(), screenRect.width()/2));
+                showSize.setWidth(qMin(newSize.width(), screenRect.width() - 200));
                 showSize.setHeight(showSize.width() * m_widthHeightRatio);
             }