Base: Launch FileSystemAccessServer at session start-up

Author: https://github.com/LucasChollet
Commit: e8115bfdb1
Pull-request: https://github.com/SerenityOS/serenity/pull/14673
Reviewed-by: https://github.com/linusg

Userland/Applications/ThemeEditor/main.cpp

@@ -39,7 +39,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         path = Core::File::absolute_path(file_to_edit);
 
     TRY(Core::System::pledge("stdio recvfd sendfd thread rpath unix"));
-    TRY(Core::System::unveil("/tmp/portal/filesystemaccess", "rw"));
+    TRY(Core::System::unveil("/tmp/user/%uid/portal/filesystemaccess", "rw"));
     TRY(Core::System::unveil("/res", "r"));
     TRY(Core::System::unveil(nullptr, nullptr));