Add automatic flag for update checks

The appstore can then known if a user clicked the check for updates
button manually or if it was done by the automatic updater.

We will fix appstore so that updates are always provided for manual checks.
automatic updates will follow our roll out plan.

We do have one issue that the automatic update checker will reset the manual
updates when it runs, but this is OK.

src/routes/cloudron.js

@@ -218,8 +218,8 @@ function checkForUpdates(req, res, next) {
     req.clearTimeout();
 
     async.series([
-        updateChecker.checkAppUpdates,
-        updateChecker.checkBoxUpdates
+        (done) => updateChecker.checkAppUpdates({ automatic: false }, done),
+        (done) => updateChecker.checkBoxUpdates({ automatic: false }, done),
     ], function () {
         next(new HttpSuccess(200, { update: updateChecker.getUpdateInfo() }));
     });