Standarddialogs example: Remove horizontal spacer from fullscreen layout.

It does not work as expected since the QLineEdits do not expand.
Amends b880b7e1

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Change-Id: I0b3b3822cca7fc6442a7155eecd46bd3d134d069
Reviewed-by: Shawn Rutledge <shawn.rutledge@theqtcompany.com>

examples/widgets/dialogs/standarddialogs/dialog.cpp

@@ -103,7 +103,6 @@ Dialog::Dialog(QWidget *parent)
         QHBoxLayout *horizontalLayout = new QHBoxLayout(this);
         QGroupBox *groupBox = new QGroupBox(QGuiApplication::applicationDisplayName(), this);
         horizontalLayout->addWidget(groupBox);
-        horizontalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::MinimumExpanding, QSizePolicy::Ignored));
         verticalLayout = new QVBoxLayout(groupBox);
     } else {
         verticalLayout = new QVBoxLayout(this);