Seahorse/buster: No more close button

While taking care of torified_gnupg.feature, updating reference images (#16281 (closed)), it was additionally noticed that one cannot get out of the Preferences window any more: the Close button disappeared in buster.

I’ve fixed/worked around it by sending an ESC key instead; but I’d be happy to get a confirmation this is the preferred way to go here.

The changed settings seem to be taken into account immediately anyway, and the whole feature passes now:

5 scenarios (5 passed)
50 steps (50 passed)
10m4.817s

Parent Task: #16281 (closed)

Original created by @CyrilBrulebois on 16341 (Redmine)