fix(as): [137364923] tencentcloud_as_scaling_config fix the issue of changing password (#3122)

* add

* add

Author: SevenEarth

.changelog/3122.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/tencentcloud_as_scaling_config: fix the issue of changing password
+```

tencentcloud/services/as/resource_tc_as_scaling_config.go

@@ -851,6 +851,7 @@ func resourceTencentCloudAsScalingConfigUpdate(d *schema.ResourceData, meta inte
 	}
 
 	if d.HasChange("password") || d.HasChange("key_ids") || d.HasChange("keep_image_login") {
+		request.LoginSettings = &as.LoginSettings{}
 		if v, ok := d.GetOk("password"); ok {
 			request.LoginSettings.Password = helper.String(v.(string))
 		}