Nextcloud client should not repetitively open account configuration window when launched in background (GNOME + Dbus service)

### Expected behaviour
- Client launched autoatically vi dbus service - > process /usr/bin/nextcloud --background
- configuration or other UI windows opens only on user request
- there should be an 'Do not show this again' checkbox

### Actual behaviour
- repetitively opens account configuration window
- no easy way to stop client when not needed

### Steps to reproduce
1. run client in background
2. use desktop
3. account configuration window appears from time time

### Client configuration
Client version:
3.3.3

Operating system:
Fedora 34/35 - Gnome

OS language:
EN_US

Client package (From Nextcloud or distro) (Linux only):
nextcloud-client-libs-3.3.3-1.fc34.x86_64
nextcloud-client-3.3.3-1.fc34.x86_64
nextcloud-client-nautilus-3.3.3-1.fc34.x86_64


Start by reproducing the GNOME D-Bus launch using /usr/bin/nextcloud --background and observe when the account configuration window appears. Trace the background startup path and verify that configuration windows remain closed until requested, with a regression test covering repeated launches.

Written by the indexing model from the issue text.