ScreenRecorder: Make Crop&Trim dialog maximizable

Give the dialog back its minimize and maximize buttons (on Windows),
without setting the Window flag.

Amends: 24796279f3

Change-Id: I2bca972c0351d0749ea3771e418449a052703329
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/plugins/screenrecorder/cropandtrim.cpp

@@ -641,6 +641,7 @@ CropAndTrimDialog::CropAndTrimDialog(const ClipInfo &clip, QWidget *parent)
     , m_clipInfo(clip)
 {
     setWindowTitle(Tr::tr("Crop and Trim"));
+    setWindowFlags(Qt::Dialog | Qt::WindowMinMaxButtonsHint); // Make maximizable
 
     m_cropWidget = new CropWidget;