Icon and title are not Pinta's

**Description**
Pinta's icon on the taskbar is the Wayland's one, its title is "dotnet". Wasn't an issue before 3.0

**To Reproduce**
Compile from tarball

**Additional Info**
![Image](https://github.com/user-attachments/assets/61f5c0c1-ab2d-40b3-a6d8-a189c9e35a1e)

**Version**
Fedora 42, Pinta 3.0
