Add appstore web token

* For existing installs, migrate using the soon to be obsoleted user_token route
* For new installs, the token post login is stashed during registration time

src/routes/appstore.js

@@ -5,7 +5,7 @@ exports = module.exports = {
     getApp,
     getAppVersion,
 
-    createUserToken,
+    getWebToken,
     registerCloudron,
     getSubscription
 };
@@ -45,11 +45,11 @@ async function getAppVersion(req, res, next) {
     next(new HttpSuccess(200, manifest));
 }
 
-async function createUserToken(req, res, next) {
-    const [error, accessToken] = await safe(appstore.createUserToken());
+async function getWebToken(req, res, next) {
+    const [error, accessToken] = await safe(appstore.getWebToken());
     if (error) return next(BoxError.toHttpError(error));
 
-    next(new HttpSuccess(201, { accessToken }));
+    next(new HttpSuccess(200, { accessToken }));
 }
 
 async function registerCloudron(req, res, next) {