Search filters for site extended search apply for site selection of configurations

Currently when I use the extended search to filter the sites, those filters still apply when I then go to a configuration and want to assign it to a site.

To reproduce:

• Add two sites:

  • South america (with site usage "Natural areas")
  • Brandenburg (with site type "Federal state")

• Use the extended search for sites

  • select the "Federal state" as site type & search
  • only Brandenburg (out of the 2 new ones) is shown

• Now go to create a new configuration

• In the site selection "South america" is not shown.

From my perspective it is wrong not to show those other sites there anymore.