[Bug] tray icon too small on HiRes display

### ⚠️ Before submitting, please verify the following: ⚠️

- [x] This is a **bug**, not a question or a configuration issue.
- [x] This issue is **not** already reported on Github (I've searched it).
- [x] Nextcloud Server and Desktop Client are **up to date**. See [Server Maintenance and Release Schedule](https://github.com/nextcloud/server/wiki/Maintenance-and-Release-Schedule) and [Desktop Releases](https://nextcloud.com/install/#install-clients) for supported versions.
- [x] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/)

### Bug description

The icon in the task bar is too small compared with others:

This had been already reported as #1486 but then closed as fixed.

### Steps to reproduce

Nothing done to reproduce, simply install nextcloud-client RPM, and start nextcloud:

```console
$ rpm -qa | grep nextcloud
nextcloud-client-libs-3.16.3-2.fc42.x86_64
nextcloud-client-3.16.3-2.fc42.x86_64
nextcloud-client-nemo-3.16.3-2.fc42.x86_64
```

### Expected behavior

Icon is automatically of a similar size as the other icons in the tray.

### Which files are affected by this bug

n/a

### Operating system

Linux

### Which version of the operating system you are running.

Fedora 42

### Package

Distro package manager

### Nextcloud Server version

Nextcloud Hub 10 (31.0.7)

### Nextcloud Desktop Client version

3.16.3

### Is this bug present after an update or on a fresh install?

Updated from a minor version (ex. 3.16.1 to 3.16.2)

### Are you using the Nextcloud Server Encryption module?

Encryption is Enabled

### Are you using an external user-backend?

- [x] Default internal user-backend
- [ ] LDAP/ Active Directory
- [ ] SSO - SAML
- [ ] Other

### Nextcloud Server logs

```shell
n/a (I doubt that it has anything to do with the server)
```

### Additional info

Screen is 3440x1440, scale is 100%, Cinnamon desktop (X11).
I can't remember when the issue appeared but it's already a while ago. It might have appeared with the upgrade to Fedora 42 but I have no clue:

```console
$ sudo dnf history list --contains-pkgs=nextcloud-client
ID Command line Date and time Action(s) Altered
62 dnf upgrade -y 2025-05-03 11:30:44 178
56 dnf system-upgrade download --releaseve 2025-05-01 08:34:41 8538
50 dnf upgrade 2025-04-11 07:22:46 490
32 dnf upgrade -y 2025-01-24 06:46:55 269

$ sudo dnf history info 32 50 56 62 | grep nextcloud-client-0
Upgrade nextcloud-client-0:3.16.3-2.fc42.x86_64 User updates
Replaced nextcloud-client-0:3.16.2-2.fc42.x86_64 User @System
Upgrade nextcloud-client-0:3.16.2-2.fc42.x86_64 User updates
Replaced nextcloud-client-0:3.16.2-2.fc41.x86_64 User @System
Upgrade nextcloud-client-0:3.16.2-2.fc41.x86_64 User updates
Replaced nextcloud-client-0:3.15.3-2.fc41.x86_64 User @System
Upgrade nextcloud-client-0:3.15.3-2.fc41.x86_64 User updates
Replaced nextcloud-client-0:3.14.2-2.fc41.x86_64 User @System
```