Remove ?next from restartUrl for JupyterHub >=1.0

packages/hub-extension/src/index.ts

@@ -58,13 +58,7 @@ function activateHubExtension(
 
   // If hubServerName is set, use JupyterHub 1.0 URL.
   const restartUrl = hubServerName
-    ? hubHost + URLExt.join(
-        hubPrefix,
-        'spawn',
-        hubUser,
-        hubServerName,
-        `?next=${hubPrefix}home`
-      )
+    ? hubHost + URLExt.join(hubPrefix, 'spawn', hubUser, hubServerName)
     : hubHost + URLExt.join(hubPrefix, `spawn?next=${hubPrefix}home`);
 
   const { commands } = app;