Drop bogus KF5Service dependency

Introduced in commit a2c13572.
Package continues to build fine after the change.

Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org>
2 jobs for master in 6 minutes and 50 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Build
passed build_clazy_clang_tidy #103123

00:03:30

passed linux kf5-qt5 qt5.15 #103122

00:03:19

24.0%