Maps: Search results box is not large enough on Flatpak build since gnome-maps-stable-3820230613160651.1

Since https://bodhi.fedoraproject.org/updates/FEDORA-FLATPAK-2023-153d758ea0 landed - I believe - when running the Fedora Flatpak build of GNOME Maps (as is built in to Silverblue installer images), when you type something into the search box, the box that drops down to show the results is far too small. It can only show part of the first result.

Here's how it looked in the Fedora-Rawhide-20230619.n.0 test (good, before the update):

Here's how it looked in the Fedora-Rawhide-20230622.n.0 (bad, after the update):

Sorry for the late report of this - I only just noticed it because at first the openQA test still passed, the reduced box still showed enough of the expected result for the needle to match. Some subsequent change - either the box got even smaller, or the results got a bit more whitespace padding - made the test start failing and made me notice this problem, but subsequent investigation showed it really appeared much earlier.