Name, homepage, backend sorting is working only for the current page

[Zlopez]

The new sorting by name, homepage and backend is not working for whole dataset, but only the current page, which is not helpful.

The behavior could be reproduced on https://stg.release-monitoring.org/projects/?page=1

[Zlopez]

@Freedisch Could you look at this as you implemented the feature itself?

[Freedisch]

Of course, I will have a look at it