Fixed a bug causing .conf.txt download on Android affecting Firefox based Android browsers. (#2269)

* Fixed a bug causing .conf.txt download on Android
... affecting Firefox based Android browsers.

* change content-type

---------

Co-authored-by: Badri Isiani <badri@loonartech.net>
Co-authored-by: Bernd Storath <999999bst@gmail.com>

src/server/api/client/[clientId]/configuration.get.ts

@@ -26,7 +26,7 @@ export default definePermissionEventHandler(
       `attachment; filename="${WireGuard.cleanClientFilename(client.name) || clientId}.conf"`
     );
 
-    setHeader(event, 'Content-Type', 'text/plain');
+    setHeader(event, 'Content-Type', 'application/octet-stream');
     return config;
   }
 );

src/server/routes/cnf/[oneTimeLink].ts

@@ -32,6 +32,6 @@ export default defineEventHandler(async (event) => {
     'Content-Disposition',
     `attachment; filename="${WireGuard.cleanClientFilename(client.name) || client.id}.conf"`
   );
-  setHeader(event, 'Content-Type', 'text/plain');
+  setHeader(event, 'Content-Type', 'application/octet-stream');
   return config;
 });