Increase hamburguer menu max-height; 340px was less than SL menu fully expanded.

services/web/public/stylesheets/core/_common-variables.less

@@ -312,7 +312,7 @@
 @navbar-border-radius:             0;
 @navbar-padding-horizontal:        floor((@grid-gutter-width / 2));
 @navbar-padding-vertical:          ((@navbar-height - @line-height-computed) / 2);
-@navbar-collapse-max-height:       340px;
+@navbar-collapse-max-height:       380px;
 
 @navbar-default-color:             #777;
 @navbar-default-bg:                #fff;