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

@@ -24,7 +24,8 @@
 	end
 -%>
 
-<ul style="margin:0; list-style-type:none; text-align:left">
+<span>
+	<ul style="margin:0; list-style-type:none; text-align:left">
 		<% if self.allowlocal then %>
 		<li style="padding:0.5em">
 			<input class="cbi-input-radio" data-update="click change"<%=attr("type", self.widget or "radio") .. attr("id", cbid .. "_empty") .. attr("name", cbid) .. attr("value", "") .. ifattr(checked[""], "checked", "checked")%> /> &#160;
@@ -88,6 +89,7 @@
 			</div>
 		</li>
 		<% end %>
-</ul>
+	</ul>
+</span>
 
 <%+cbi/valuefooter%>