Revert "Call update_scrollbars() in sort_children() so the max is set properly so you can set scroll_container.scroll_vertical instantly after adding children to a scroll container."

This reverts commit b73d2980b7e6a823f5065315355f7f7af20f6660.

This caused a regression. Fixes #63417.

scene/gui/scroll_container.cpp

@@ -304,7 +304,6 @@ void ScrollContainer::_update_dimensions() {
 		fit_child_in_rect(c, r);
 	}
 
-	update_scrollbars();
 	update();
 }