Make sure history container is always the latest for scrolling load

loadHistoryPage is run on scroll, which might be triggered before htmx fully
refreshes content(e.g. when receiving mainContainerChanged event), at which
time container could be outdated.

This fixes the issue that after ticket/asset queue/catalog is changed on
display page via inline edit, history widget may fetch the same content
endlessly.

share/html/Elements/ShowHistoryHeader

@@ -198,7 +198,8 @@ jQuery(function(){
     };
 
     var loadHistoryPage = function() {
-        if (isLoading || container.hasAttribute('data-disable-scroll-loading')) return;
+        container = document.querySelector('div.history-container');
+        if (isLoading || !container || container.hasAttribute('data-disable-scroll-loading')) return;
 
         isLoading = true;
         showLoadingMessage();