Fix fixing the date-marker not being removed when it should be.

Accidentally copy-pasted more than I should have when I moved the scrollable height calculation code, and I caused the older
messages to be added before doing checks for the date-markers, which would fail.

client/js/lounge.js

@@ -512,7 +512,6 @@ $(function() {
 		// get the scrollable wrapper around messages
 		var scrollable = chan.closest(".chat");
 		var heightOld = chan.height();
-		chan.prepend(documentFragment).end();
 
 		// Remove the date-change marker we put at the top, because it may
 		// not actually be a date change now
@@ -524,6 +523,9 @@ $(function() {
 			children.eq(1).remove();
 		}
 
+		// Add the older messages
+		chan.prepend(documentFragment).end();
+
 		// restore scroll position
 		var position = chan.height() - heightOld;
 		scrollable.scrollTop(position);