Adriaan de Groot authored Apr 02, 2022 and Albert Astals Cid committed Apr 20, 2022

In KCoreAddons dc48123f632781f53dc445d38c005e903b479fa2 the formatting
of relative dates was changed. The KCoreAddons unittests were adapted,
but not the Baloo unittests.

Change the RE to match the newly-introduced " at " string.