luci-base/firewall_zonelist: fix visual interface/background alignment

* fix for #1667, tested with all standard themes

Signed-off-by: Dirk Brenken <dev@brenken.org>

modules/luci-base/luasrc/view/cbi/firewall_zonelist.htm

@@ -24,6 +24,7 @@
 	end
 -%>
 
+<span>
 	<ul style="margin:0; list-style-type:none; text-align:left">
 		<% if self.allowlocal then %>
 		<li style="padding:0.5em">
@@ -89,5 +90,6 @@
 		</li>
 		<% end %>
 	</ul>
+</span>
 
 <%+cbi/valuefooter%>