luci-app-ssr-plus: set rmempty=true for uci cursor

luci-app-ssr-plus/luasrc/model/cbi/shadowsocksr/client-config.lua

@@ -288,7 +288,7 @@ end
 o.cfgvalue = function(self, section)
 	return self.map.uci:get("shadowsocksr", "@server_subscribe[0]", "xray_hy2_type") or "hysteria2"
 end
-o.rmempty = false
+o.rmempty = true
 o.write = function(self, section, value)
 	-- 更新 server_subscribe 的 xray_hy2_type
 	local old_value = self.map.uci:get("shadowsocksr", "@server_subscribe[0]", "xray_hy2_type")
@@ -358,7 +358,7 @@ o.cfgvalue = function(self, section)
 	return self.map.uci:get("shadowsocksr", "@server_subscribe[0]", "ss_type") or "ss-rust"
 end
 o:depends("type", "ss")
-o.rmempty = false
+o.rmempty = true
 o.write = function(self, section, value)
 	-- 更新 server_subscribe 的 ss_type
 	local old_value = self.map.uci:get("shadowsocksr", "@server_subscribe[0]", "ss_type")