Fix case problem with promoted widget include file

Deal with issue where Designer changes include file name for
promoted widget to lower case.

Libs/DICOM/Widgets/Resources/UI/ctkDICOMQueryWidget.ui

@@ -159,7 +159,7 @@
   <customwidget>
    <class>ctkDateRangeWidget</class>
    <extends>QWidget</extends>
-   <header>ctkdaterangewidget.h</header>
+   <header>ctkDateRangeWidget.h</header>
    <container>1</container>
   </customwidget>
  </customwidgets>