Calendar: Fix all day non-blocking events hover display issue

When there are too many all day events, we hide some and only show them all on hover.  The day indicator was overlaid over the revealed events

calendar/js/et2_widget_timegrid.ts

@@ -2218,7 +2218,7 @@ export class et2_calendar_timegrid extends et2_calendar_view implements et2_IDet
 					height: $node.height() > parseInt($node.css('line-height')) ?
 							$node.css('padding-bottom') : '100%'
 				});
-				day = node;
+				day = node.querySelector(".calendar_calDayColHeader_spacer") ?? node;
 				this.gridHover
 					.attr('data-non_blocking', 'true');
 				break;