Save and restore layout of key list is lookup dialog

This also fixes the issue that all columns were displayed in the lookup
dialog.

GnuPG-bug-id: 5388
2 jobs for master in 18 minutes and 10 seconds (queued for 140 minutes and 17 seconds)
Status Name Job ID Coverage
  Build
passed build_clazy_clang_tidy #100350

00:11:32

passed linux kf5-qt5 qt5.15 #100349

00:06:38

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