* Rocket.Chat: fix not working login with newer desktop clients

there were two problems:
1. Whatever URL you specify, the client removes the path and queries just /, our index.php now detects Rocket.Chat User-Agent header and redirects to /rocketchat/ in that case
2. our manifest.json an webworker registration was not using the individual webserver-URL but as static path

api/js/login.js

@@ -77,7 +77,7 @@ egw_LAB.wait(function()
 
 // register service worker
 if ('serviceWorker' in navigator) {
-  navigator.serviceWorker.register('./service-worker.js', {scope:"/egroupware/"})
+  navigator.serviceWorker.register('./service-worker.js', {scope:egw_webserverUrl})
   .then(function(registration) {
     console.log('Registration successful, scope is:', registration.scope);
   })

index.php

@@ -14,6 +14,14 @@ use EGroupware\Api;
 use EGroupware\Api\Framework;
 use EGroupware\Api\Egw;
 
+// Rocket.Chat desktop clients ignore /rocketchat/ path in URL and use just /
+// --> redirect them back to /rocketchat/
+if (strpos($_SERVER['HTTP_USER_AGENT'], 'Rocket.Chat') !== false)
+{
+	header('Location: /rocketchat/');
+	exit;
+}
+
 // support of Mac or iPhone trying to autodetect CalDAV or CardDAV support
 // if EGroupware is not installed in the docroot, you need either this code in the index.php there,
 // or an uncoditional redirect to this file or copy groupdav.htaccess to your docroot as .htaccess

manifest.json

@@ -19,7 +19,7 @@
 	"start_url": "index.php",
 	"background_color": "#fafafa",
 	"display": "standalone",
-	"scope": "/egroupware",
+	"scope": "/",
 	"theme_color": "#0073ae",
 	"serviceworker": {
 		"src": "/service-worker.js"