fix(xo-server/proxies): remove duplicated license unbind (#4977)

On destroying a proxy, the license will be unbound twice: on the proxy destruction and on the proxy unregistration.

These unbinds will lead to an error which will be displayed in the console and will have no side effects on the process. This error will not be visible by users.

packages/xo-server/src/xo-mixins/proxies.js

@@ -110,13 +110,6 @@ export default class Proxy {
           throw error
         }
       }
-
-      this._app
-        .unbindLicense({
-          boundObjectId: vmUuid,
-          productId: this._xoProxyConf.licenseProductId,
-        })
-        .catch(log.warn)
     }
     return this.unregisterProxy(id)
   }