解决serviceType传0获取不到的问题

xim/index.ts

@@ -37,7 +37,7 @@ class Chat {
         }
         this._sdk = option.sdk;
         this._orgId = option.orgId;
-        option.serviceType && (this.serviceType = option.serviceType);
+        option.serviceType !== undefined && (this.serviceType = option.serviceType);
         option.product && (this.product = option.product);
         this.eventHub = option.eventHub;
         if (option.user) {