MINOR Disabled 'showcalendar' option on CMSMain->SiteTreeFilterDateFi…

…eld() - it causes the CMS to load jQuery UI javascript just for this (rarely used field). To be re-enabled once we work with jQuery UI on a broader scale. (from r107784)

git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/cms/trunk@112612 467b73ca-7a2a-4603-9d3b-597d59a354a9

code/CMSMain.php

@@ -1128,7 +1128,7 @@ function SearchTreeForm() {
 					_t('CMSMain.TITLEOPT', 'Title')
 				),
 				new TextField('Content', 'Text'),
-				new CalendarDateField('EditedSince', _t('CMSMain_left.ss.EDITEDSINCE','Edited Since')),
+				new DateField('EditedSince', _t('CMSMain_left.ss.EDITEDSINCE','Edited Since')),
 				new DropdownField('ClassName', 'Page Type', $pageTypes, null, null, 'Any'),
 				new TextField(
 					'MenuTitle',