Fix bandwidth compare (#1679)

It may cause all proxy restart when api reload.

models/config/proxy.go

@@ -149,7 +149,7 @@ func (cfg *BaseProxyConf) compare(cmp *BaseProxyConf) bool {
 		cfg.Group != cmp.Group ||
 		cfg.GroupKey != cmp.GroupKey ||
 		cfg.ProxyProtocolVersion != cmp.ProxyProtocolVersion ||
-		cfg.BandwidthLimit.Equal(&cmp.BandwidthLimit) ||
+		!cfg.BandwidthLimit.Equal(&cmp.BandwidthLimit) ||
 		!reflect.DeepEqual(cfg.Metas, cmp.Metas) {
 		return false
 	}