Nextcloud client won't fit screen on Plasma mobile

### Expected behaviour
Open the client and log in Nexctloud

### Actual behaviour
Can't log in since "log in"-button is outside of the screen

### Steps to reproduce
1. Install client on PlasmaMobile (or Phosh)
2. open it
3. scratch your head

### Client configuration
Client version:
All

Operating system:
Manjaro PlasmaMobile and Manjaro Phosh

OS language:
No matter, but English atm

Qt version used by client package (Linux only, see also Settings dialog):
5.15

Client package (From Nextcloud or distro) (Linux only):
3.1.2

I know this is "desktop client", but it would work very well on mobile linux too if client window would scale to mobile size.