Reduce margin around Qt4ProjectConfigWidget

* This makes sure this widget gets the same margins as all the
   others.

Reviewed-by: dt

src/plugins/qt4projectmanager/qt4projectconfigwidget.ui

@@ -11,6 +11,9 @@
    </rect>
   </property>
   <layout class="QFormLayout" name="formLayout">
+   <property name="margin">
+    <number>0</number>
+   </property>
    <item row="1" column="1">
     <widget class="QLineEdit" name="nameLineEdit">
      <property name="sizePolicy">