QmlDesigner.propertyEditor: increasing minimum width

Task-number: QTCREATORBUG-5491
Change-Id: I1f3d0c553537d51042dc0b00e5d4de882c27a07e
Reviewed-on: http://codereview.qt.nokia.com/1740

Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@nokia.com>

share/qtcreator/qmldesigner/propertyeditor/Qt/PropertyFrame.qml

@@ -36,7 +36,7 @@ import Bauhaus 1.0
 WidgetFrame {
    id: propertyFrame;
 
-    minimumWidth: 300;
+    minimumWidth: 320;
     property int frameWidth: width
     property int labelWidth: 96