Add a missing KConfig linkage

Currently things work due to transitiveness, but we better not rely on that
2 jobs for master in 12 minutes and 27 seconds (queued for 54 minutes and 52 seconds)
Status Name Job ID Coverage
  Build
passed build_clazy_clang_tidy #99146

00:07:10

passed linux kf5-qt5 qt5.15 #99145

00:05:16

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